Bad WiFi service from Telkom

A couple of years ago, when we still had a landline, Telkom installed an optical fiber line to our house. At that stage we were still using a DSTV satellite dish. Last year we started streaming DSTV and Netflix and other channels, and all the trouble started. The channels started buffering, especially when there was high demand from the neighbours. On several occasions I had to phone Open Serve, the optical fiber installer, to fix the problem. The fix only lasted for a day or two and then started again. Out of pure desperation I went to the Telkom branch in the Woodlands Mall. One of the consultants suggested that we use an LTE router and cancel the fiber connection. We did this and now the problem is much worse. The download speed is sometimes as low as 0,7mb/s and the upload speed is about 1,3mb/s. The internet speed keeps on fluctuating up and down. I took the route back to Telkom, but the consultant there just shrugged his shoulders and said nothing could be done. I would really recommend, that other customers considering Telkom WiFi, rather use a different service provider.