Terrible Telephonic Sales Service

I was called by Telkom call center offerring home LTE uncapped for R699/month. I was looking for a package similar so decided to take it and gave all my details over the phone including ID and bank details to debit my account. It is now gone 4 weeks and i have had not further communication and Telkom either cannot assist me. I have been to the Telkom stores who has referred my to call center to call center to call center. The ones i can hold of cant assist and there are some numbers that will just ring for half an hour and still no answer. I usually would not have bothered but because i gave my bank details, i am concerned and want to get to the bottom of this. So far all the telkom people i have spoken to have just brushed this off to another number.