Caution: Space Cat Creations

I paid 40% upfront for a commission May 18th of 2021. The commission was originally agreed upon to be completed before MFF in November. Maker ran into some issues with creating so we pushed the date back to December. December comes along, still no head and very little progress. SCC informs me they are unable to work within my time frame and offers a partial refund + to send what they did have back to me. This sounded like a best case scenario so I accepted the offer. Here we are, 2 months later, in January, and still no base. I did receive the partial refund. However, now SCC is reaching back out to demand more money than we originally agreed upon for the head claiming they miscalculated costs.
This is not at the fault of the customer. They took on a commission you could not handle. Could not maintain a professional timeframe. Could not keep up their end of the refund agreement. And now want more money from me.
I have been friendly, understanding, and respectful this entire time. The time frame to submit a paypal dispute is LONG gone so I am just out $100 and the City Mutt Fursuits base I paid for covered in the quote. Please see screenshots for confirmation of everything here, I have captured every word. Do not do business here! This maker will string you along.

TLDR: Maker took on commission they couldn't handle, did not hold up their end of the partial refund agreement, and returns to my DMs to request more money after stringing me along for 8 months.