Cell-C Fibre is *********** and ********** by charging me for 50Mpbs while I receive less than even 20Mbps

Cell C, is very ***********. I keep asking for help sending emails after emails with speed-test images showing how week my connection is but they keep ignoring me. I am really left with getting a different service provider now who will listen to me and attend to my complains. I have recently upgraded from 20Mbps to 50Mbps but I dont see any difference. Cell-C Fibre keeps telling me that they upgraded me but i receive even far less than what I used to receive from 20Mbps, this is a total ripoff. All I wanted was to have an improved speed to receive an additional 4k quality (Google) for my TV but instead the videos quality buffers forever. I am sick and tired of people calling me to fix and the improvement only lasts less than three hours and goes back to lower than 20Mbps. The worst thing is when there is when my internet keeps disconnecting every hour and no one can solve this, but it disturbs my online work. If I dont receive a technician (the one I will not be paying, as the problem is caused by Cell-C) to come to my home and fix my connection, the next time you hear from me is cancelling the contract. I will not continue paying for a service I am not receiving, this is ********. I looks like I made a mistake upgrading cause now the quality is worse than what I had previously.