Horrible Service want to cancel my contract

My husband and I have been struggle for almost a month now with no internet connection. On the 8th of September we reported a fault with our line as previously since the beginning of September we had been getting poor signal and had to keep login in the the Wi-Fi after trying to reboot which always kicked all our setting out on the router. We received the replacement router almost more than a week later after calling and threating as NO ONE EVER GETS BACK TO YOU NOT EVEN A MANAGER. After reporting the fault they advised its an issue on telkoms side as my landline phone keeps crackling and that fault was reported on the 22nd of September to date no call from Telkom from a technician wanting to come out to inspect. I want to cancel both contracts now with Telkom and Web Africa as you are in breech of your contract with the 2 contracts we paying sometimes close to R900 a month and not getting the service we should. Shall I add our landline now doesn't make any out going calls now so now this is all costing us money as we are having to buy more airtime and data. WE ARE AT OUR WITS END AND HAVING THEM BY CLISE OF BUISNESS TOMORROW 8TH OF OCTOBER TO SORT THIS OUT OTHERWISE I WILL BE CANCELLING BOTH CONTRACTS.