I can totally respect, and understand, the concept of customer service that is being applied to this situation. Let's take a peek at the details that weren't mentioned.
This user created a second account to donate with, strictly for the purpose of advertising a CPA network. CPA networks need approval from Admins, as the potential for scamming is extremely high. His original account, posing as an affiliate of the network he's wanting to advertise as his, can be found here:
http://www.blackhatworld.com/blackhat-seo/cpa/415620-maxbounty.html#post3957804
The CPA network he wants to advertise is less than three months old.
That's pretty much grounds for a perm ban on both accounts, as he's already being deceptive by advertising himself as an affiliate on the other account, while trying to establish a new account as the owner. I explained to the guy how to go about getting a refund, and suggested he do so.
Just remember folks, there are often more details to the story that they aren't sharing for obvious reasons. Nobody said he couldn't have a custom sig, his sig broke other rules which is where the issue comes in. Donations are appreciated by the owner, but does not excuse you from following the rules.