Worst Service Ever received from the provider, I dont want my name mixed with them ever

I previously ordered and LTE 10Mb Non Business Hours Uncapped line and the service i have received does not even get above 2MB, I subsequently logged calls to cancel the service within the 7 days grace period they offer and to date no one has cancelled the contract as it is useless to me. First Call to Cancel and they deployed an engineer who failed to guarantee service. 03/07/2019 - 14:30 ***

Second Call for follow up Cancellation: 09/07/2019 - 13:00 ***

Third call to cancel 15/07/2019 - 13:*** On all this numerous occasions keep getting sms's saying my fault is resolved yet the service is running and i will sure be held accountable for it. I even went to the extent of logging and trying to delete or cancel the contract on self service but my profile does not exist there to allow me to cancel the service.