Account debited even though line not activated

I have signed up for an uncapped adsl line with mweb in mid March. Since the free router was delivered, I have been trying to set it up. There were problems with the line, which was escalated to Telkom. Telkom came to check the line last month, on the 18th April. Telkom provided assistance only last week. I then called mweb again since the router was still not working (broadband light flashing and internet light not on). I checked my account and I was debited R743 last month and am due to pay R339 this month. I have received NO FEEDBACK from mweb and demand a refund for last month since the problem was sitting with Mweb and they did not get back to me. I will not pay for a service that was not delivered. I will only pay once my router has been set up. I called the call center and spoke to Mohammed. He advised my account will be credited, but when I held on for accounts- there was no answer.