pathetic service

I don't even know where to start, I took a laptop through telkom in February 2016 all my details were on the application form and till today when I get my statement my physical address is wrong I've emailed and contacted the customer care for help and was assured things were corrected, what frustrated me the most is the debit order, I requested for it to deduct on the 20th and this also I was assured will happen till today the debit order is still not going off on the right date,so on the 22/04/2016 11:29am I called the customer care and spoke to Nkosikhona who sounded like he didn't know what he was doing, I told him my problem and he told me he will cancel the debit order and I will pay manually and that he will correct my address,he gave me banking details in order to make a manual payment of which I did it same day of R733.00 and advised me to use the 19 digit ref on my statement. on the 26/04/2016 I was deducted R732.20 which made my cheque acc to be overdrawn.i called the care line and spoke to Queen who then told me the debit order is not showing as yet on her system and also that the debit order cannot be cancelled therefore Nkosikhona gave me the wrong information and that my address was still not corrected,i was so angry and just hung up the fone. All I want is my refund and just correct my debit order date to the 20th and address .I'm even considering moving this contract to another service provider im sure il actually get gud service.