Got An Email That A Company Accidentally Refunded Me The Full Amount And Want Their Money Back

Location: Ohio, USA

I bought these seat covers from Coverland USA for like $300 back in the beginning of July. As soon as they came in and I put them on, I realized they did not fit as snug as they said it would even though they said it was made specifically for my vehicles year make and model.
I looked online to see what their refund policy was like and on a forum somebody said that they would only refund you 25% and let you keep the covers.
I emailed them the issue and after sending them a picture of the covers, with the cover model number they replied:

“Unfortunately we do not have any alternative size available for your vehicle. We apologize for the inconvenience. As an alternative solution, would you be willing to keep the seat covers with a 25% refund?”

I agreed and saw that they refunded me about $75 yesterday.
Just this afternoon I received an email that said:

“We sincerely apologize for reaching out to you regarding this matter. Unfortunately, our backend Team mistakenly processed a full refund to your order. The refund amount of $225 was issued in error. If possible, we kindly ask you that you return the incorrect funded amount of $225 to us. We will send you an invoice for this amount with the payment details. We sincerely apologize for the inconvenience and any confusion this may cause, and we truly appreciate your understanding and cooperation.”

I’m under the impression that I should just let it go and pocket the 300. Their reviews are pretty bad and a many people are unhappy with their customer service, quality and fitment they try to convince you is premium and tight fitting.

Hoping to see what you all have to say, thanks