No internet for over a month

For over a month I have been calling into the Call Centre due to slow internet. For the past week I have called the centre 3 times because now I have no internet. All I'm told is that I should be patient it will be attended but it has been over a month with low speeds or no internet at all. No one bothers to call or update me on the fault, NOTHING. I pay over R700 per month and I am not getting any service. Am I expected to pay come month end even without any service? Please can we resolve this before its too late.