account tier dropped

I have noticed my account level has been dropped from platinum cheque to premier , I only noticed when I checked mmy card statement slow lounge entries had not been reversed , and I don't understand how this is because I have been platinum cheque all along , as well as a platinum credit card holder , furthermore on my online profile it shows you can upgrade immediately to private client , had I known about this I would not have even gone to the slow lounge , im extremely disappointed with FNB