Terrible service received

Terrible service received from Vodacom. Vodacom sales person phoned me 11/07/19 selling a 20g day 20g night contract which I accepted. I informed them that my bank account can be debited on the 20th monthly which they said would debit starting 20/08/19. My account got debited 18/7/19 which resulted in an unpaid debit order on my bank account. I contacted Vodacom 19/7/19 to find out why they debiting my account I was told it is the initiation fee and that the back office or whoever would get back to me. 20/08/19 I get charged a penalty fee of R100 cause of payment not received 18/7/19. I have logged a dispute because I feel it was totally unfair as I have already disputed this on 19/7/19 and I am now frustrated with the call centre that I have phoned numerous times, whom every time escalate the issue which takes 7 days. I've been waiting since 13/08/19 for query to be solved only to be given a new Ref number *** given 11/09/19 @20:16 with another 7days waiting period. I fail to understand why the issue has not been dealt with since July and August.Can you people just get it right the first time. I feel like you don't care for your customers.