Account that is *****ed up

This month the imbeciles at Cell C send me a statement of R2009 as the say I didn't paid my account in February I paid on 2 February and amount of R876 now they come with the excuse that I used the wrong reference but it's the same reference that I used for the last year it's just the these imbeciles can't do a Bank reconciliation and now it seems they can't even read all that I owe them this month is R820 witch is my normal installment they always say the resolve the problem but they can't resolve anything as the are not *********** to do anything right they can just ***** up and try and ***** from there clients I will never refer anyone to get a contract from Cell C and as soon as my contract expires I will move to another company because I don't need the stress these imbeciles put on me it seems from the top management to the lowest employee they are all imbeciles