6 Attempts to cancel contract because of 3+ months of no wifi coverage.

So I have now tried 6 times to cancel my LTE telkom contract, reasoning being that for 3+ months I have not been getting good network coverage/signal. I get less than 1mbps and this is very ridiculous, I phoned numerous times to get this resolved but every single time my query/request gets resolved and I receive sms's with a message saying query resolved but nothing has been done and when I phone back they give me poor excuses like the agent didnt capture all details or "we did phone but you never answered" but no proof of when they phoned can be provided as not 1 single person has phoned me to date! I than phoned now to cancel this contract as it is useless to me and for 6 times I just cant get this contract cancelled but they expect me to pay every month for a useless wifi network, I was told a technician has to come out and investigate the coverage issue and if there is an issue I will only be charged for the device fee to cancel this contract, well it is now over 3 months and I am still waiting for a technician I am still waiting for anyone from Telkom to get back to me but guess what....My query is resolved...???? with NO RESOLUTION. I request my contract be terminated immediately I do not want to hear any excuses anymore I cannot be paying you guys every month for WIFI THAT DOES NOT WOR**** Please get this resolved right away. Thank you.