It has happened in the past with other sponsors. Keep an eye on it. Some of us (at times) have taken a screen shot/print to file of our account on a monthly basis just in case this kind of thing happens and we can prove they were once there etc. I stay on top of my account and make lots of notes on my spreadsheet.
I was on AM site this morning and decided, what the heck, I would do an online chat about my missing 50AM from the Sobeys shop before Christmas email. It took about 15 min of chit chatting but they gave me the AM in the end.
I then promptly dropped 12000AM on a trip for my youngest DS and I to go to Universal after he finishes college in April. (He'll still have 1 course to do to graduate, they changed the course on him mid way through, but close enough) DH nose is a bit out of joint that he's not included but I knew he didn't want to go anyway (someone has to stay home with the dog, she's 12). He just wanted to be asked. This son is such a quiet undemanding type, it's nice to be able to do something for him that's special.