Poor Service from Cell C fibre

Cell C does not care about customer service. Is is now for more than a week that I struggle without solving the problem. Everyday from 17hoo the internet line speed drop from average 95 meg per second to about 4. During the day its fine. I am from the opinion that they throttle us. However this package is uncapped. When I brought up the issue Cell respond to me that it does not happened in my case. We use bulk of the internet during the evenings. I therefore do not have any other option as to cancel my contract. To cancel the contract is also not easy you have to do it online that can take a few day.