Unable to cancel Cell C LTE-A data contract

I have been getting poor service/connection on my LTE-A contract for the past month now. I cannot tolerate this anymore. I've noticed that many other customers have been affected by this. I want to cancel this contract, but unable to do so. After struggling to get through to the Customer Service Help desk, I requested to go through to the cancellations department. The consultant transferred me to the cancellations dpt. after which the call got dropped with the "number does not exist" response. The number the consultant supp**** me with - 084 143 - does not work at all, even as stated on internet. The number simply doesn't exist. I am getting the impression that Cell C are trying to dodge unhappy clients, by disabling the department's contact service. Please note that this has NOTHING to do with me being out of the coverage area whatsoever. I have had service in the past, but I cannot deal with this intermittent loss of service/connection. I pay for a service each month which I don't get. I lose countless data I cannot use due to this. I wanted to cancel the contract by today 30/07/2019 in order to terminate the contract by the end of July. I hope to get a response soon.