Telkom Mobile account issues.

I took a phone contract with this company and advised them on the debit date every month. suddenly they do not debit my account at all for some reason that i don't know. they go ahead and suspend my account and when i call to find out why they say my account is in areas. when i try to find out why it is in areas they say the store has billed me incorrectly and they are a different department. so now no one can assist me with this because their call Centre people keeps on cutting my calls when i call to get a solution. they are the ones who doesn't debit my account according to the contract i signed but now they make it my problem. when i call to get assisted they cut my calls. worse part they agree that they didn't debit my account but still hand me over for collection!