Amazon has started releasing some sellers' funds back to them after many UK and EU sellers complained of money being held unexpectedly.
The change in policy comes after the BBC reported Amazon's actions had led to some businesses being close to collapse.
Amazon has told some sellers it will now delay the temporary holds on money until January 2024.
But one ink seller, Daniel Moore, who had £230,000 frozen, said Amazon were only "delaying our anguish".
Amazon wrote in an e-mail to one seller on Saturday: "We understand that the transition to this policy on August 3 has caused a one-time cash-flow issue for your business. To support you in preparing for the policy change, we have extended your policy transition until January 31, 2024."
Amazon's initial policy update sent in May stated it would temporarily hold seller funds to cover customer refund demands. It said sellers would be able to withdraw their money only from the delivery date plus a further seven days.
Policy
The policy was implemented across the UK and EU for sellers registered before August 2016.
But Amazon's e-mail about the change was not seen by all sellers. In many cases, it was automatically sent to their junk folder.
The change comes at a time firms are struggling with the soaring costs of living and increases in energy bills, materials and operating costs.
Andy Pycock sells home, garden and leisure products on Amazon and had £25,000 frozen on August 3.
He said Amazon's explanations as to why it will be holding money from established sellers like him sounded like "corporate gobbledegook".
"This doesn't make any sense," Andy added. "Amazon is toxic as equally as it is brilliant - but we also feel they're our greatest enemy right now."
Dread
He "dreads" looking at his Amazon Seller account due to its various changes and "confusing" implementation of policy.
Amazon said the policy was introduced to align all sellers worldwide on to the same structure.
However, some UK and EU sellers have been told it will be implemented in September, whilst others are now being told it will be implemented in January .
One seller on Amazon's Seller Forums called the situation "shambolic".
Daniel Moore said that amount of his takings which Amazon had frozen was "disproportionately high versus the potential refunds processed by customer returns or non-delivery".
Having hundreds of thousands of pounds of his takings frozen meant he was unable to pay his VAT bill on time, or order new stock.
Issues
He received notification on Saturday saying all of his takings had now been released, but that the pause in income led to issues along his whole supply chain that could take up to two further weeks to resolve.
Daniel said new the policy "is still unfair" and that established sellers like his firm posed "no risk" to Amazon, and should not have "suffer a delay in payment" - especially as he is used to withdrawing money every day.
Amazon said many sellers now have access to funds. A spokesperson said: "We are listening to sellers' concerns and are in contact with those who have experienced a one-time cash flow disruption."
The issues are similar to those faced by Etsy sellers after that marketplace began withholding 75% of sellers' funds for around 45 days. Hundreds of sellers complained it was undermining their businesses. Etsy reduced the amount it was holding after a BBC story.
FTSE 100
The UK's top share index, the FTSE 100, was down seven points at 7,516 shortly after opening this morning, following Friday's-94-point fall on interest-rate fears.
No FTSE 350 companies are due to report today.
Brent crude futures were down 1.20% at $85.74 a barrel.