BioLife Plasma Services review: payment

I have been donating for quite a while now. I donate twice EVERY SINGLE WEEK. Yet, even though it states that I get paid a certain amount of money, I never do. Now instead of the $70 that I was suppose to get ( even though I'm suppose to get $90) they gave me $55. I don't understand and I've called numerous times and no one will help me. The staff is great and super friendly and can't say anything about them because they are ALL doing a wonderful job but I just wish my money would start being situated right or I will stop coming here.