Not the same issue but something similiar. There was a deal to spend $60 and get $10 added to your wallet. I got an email from PSN stating that I spent $139.00 and here was my $10.00 credit. I was expecting to receive $20, unless my math is wrong. I could not find any fine print about only one offer per customer.
Thanks everyone for the help and help moved the thread to the right place (sorry, I am a total n00b when it comes to forums ). This is the promotion that i was talking about. I purchased mine at 10/26/2013
How did you join/renew Plus? Was it a Plus card from a retailer or was it directly thru the Playstation store?