Cell C fiber

Hi had Cell C uncapped super fast fiber installed to my home. For the last 6 months this service has subsequently gone from good to being absolutely terrible. It’s as if I am back on dial up. I have sent numerous complains done numerous speed tests ( please see the requirements on the speed test 1. Require you to connect a device via Ethernet, 2. require you to switch all other devices not to be operational whilst testing 3. Require you to deactivate firewalls and virus protection etc etc Even doing all this the 100 Mbs line is nowhere near what was promised. I would be lucky if we reach a download speed of 10 and upload speed of 18. To add insult to injury through no fault of mine Cell C did not collect the debit order or collected it incorrectly and decided I owe them a further R29,00 for which they immediately sent out emails and shut off my fiber. Not within 7 days or anything like that really immediately first email arrived Your in arrears, Second email service suspended same day. I have two accounts of the same nature with Cell C and open serve one is okay the other is terrible. What’s worse is I recommended this service to numerous other people because it appeared to be fine but now they also complaining of similar lag. Cell C also unilaterally decided that the question was resolved and sorted and sent me a notice to that effect ? Don’t use this service because it’s not cheap if and when you add up install costs etc. I don’t know where else to go because Cell C has decided the matter is settled.