disgraceful service & treatment

I am having unbelievable problems with multichoice since signing a 24 hour price lock contract in November. Every month they try and deduct too much money from my bank account, there have been numerous phone calls, emails, apologies, promises - and nothing gets resolved. My service is now suspended on a daily basis and after contacting the call center I am reconnected with an apology and a promise that it will get sorted out. But it never does! I am at my wits end and totally disgusted with this organisation. And I cannot speak to anyone in authority!! I WANT THIS PROBLEM SORTED OUT!