Unprofessional treatment by Queenspark

I had an account with Queenspark for many years and paying well.i am not owing any cent on the account.in June I went to the mimosa branch in Bloemfontein hoping to buy from my account and only then that I was told by the cashier that my account is closed.i have tried to reopen the account twice but they couldn't help me.my point is that they made me appear as an idiot to think that the account is active all the way because they have been sending me correspondence of sale, but they failed to send me notification that they are closing my account.i feel disappointed because I have been a loyal customer to them for so many years and they are treating me like that?I stood in the store for more than an hour to have the account reopened but nothing helped.i further went to the Loglogan branch in Bloemfontein and also stood there for more than an hour to try and reopen the account but still that could not help.i feel that Queespark doesn't treat their clients with the respect that they deserve.my records can show how best have I conducted myself with this account.and at no given point were I informed of this terms and conditions .I feel betrayed!please helpme