WORST CUSTOMER SERVICE BY GAMES!!!!

This is my third complaint against Game Stores credit department. I still have not been assisted. In fact Game has been passing the buck to RCS when it should compel RCS to resolve the matter since they have a business relationship. My store card is written Game and not RCS. The issue that I have relates to the fact that having given Game/RCS all my banking details I am getting irritating text sms indicating that the debit order has not gone through. Initially I was told lies that it is incorrect and later that it has been rejected by my bank. At a later stage I was informed that in fact somebody failed to load the debit order. I have been assured that the problem is sorted out in the past but the problem persists. My bank account has never been unable to meet any debit order from this entity. I need this problem to be sorted out by Game since they have that leverage with RCS if indeed it is a problem of the latter.