Vodacom , Poor service breeds unhappy customers !

I had taken out a Vodacom cellphone contract telephonically in May this year. I have only used the sim card for about one month because the network was always bad. Last week I received a SMS from Vodacom saying that my contract is in arrears. I got a bank statement to see what was goin on. There I see that Vodacom has been trying to debit the money on other dates. The debit date that I agreed on was 1st of every month and I made it my duty that before the 1st the money was always deposited into my account. This is the reason that the account has been in arrears. I contacted the call center on many occasions, spent hundreds of rands of airtime and till today I still don't have a solution. The staff are very *********** as they have requested a copy of my bank statement as well as I have requested a copy of the call recording. I have the bank statement but no one seems to know who I should forward it to,as for the recording I have not received it as yet . I am appalled at the service from Vodacom and fear this will have a negative effect on my credit score , yet the fault is not mine . I only hope Vodacom can take some accountability and resolve my query .