Bump for this.
Out of curiosity, what were the two sponsors? And, did you get any email about the changes made?
Matyko has recently brought up how some NATS programs have the email confirmations turned off, making it easy for these type of changes to go unnoticed.
https://gfy.com/showthread.php?t=1127211
If you have details about what the payment details are changed to, I would post those too in the hopes of exposing the individual for the thieving fuck they are.