Student Finance- printing credit issues.

I have DSA for my student finance for uni that begins in September with it i get printing credit which i send receipts of to SFE when i buy paper/ink for university which they then reimburse me. However, the other day on Amazon, I bought ink, which I then sent SFE a ss of copy of the receipt. however, there was a mishap with Amazon essentially saying the product arrived but never did, and I am getting a refund. What do i do? because ive tried to call SFE so they are aware but its always impossible to contact them due to the lack of emails, hour long+ waiting times for phone calls and no online chat bot available etc. Does anyone have any advice for what I could do it says I could be reported for fraud by the finance company for wrongful receipts as I'm 'supposedly' trying to get extra money.
Incase anyone is confused i buy the items send recipts to SFE they then contact the company to verify and then renburse me long story short. Any help/ advice would be much appreciated!