Poor service from Tekom

Where to start?i ordered a telephone line for my business a couple years back. Ever since the line has been installed it has never worked continuously for a month with regular breaks in service but I always paid my account in full. In the past 6 months my line has stopped working all together and I have resorted to using cellphones in my business. I have made close to 4-5 calls to Telkom to sort the problem out with each call cente employee promising to sort the problem out but to no avail. Furthermore I have received an account saying I owe R1800 for services I never received. My last call to Telkom, after being passed from pillar to post I got through to a Telkom employee who promised to cancel the bill and sort the problem out..that didn't happen. I have now received a letter of demand for the 'outstanding' amount and being threatened to being blacklisted. I even tried cancelling the line altogether but that proved even more difficult.<br> <br> As you can see I have been more than patient but this has crossed all lines of customer service. I have reached my wits end. I am now considering legal advice.