Line speeds are ridiculous

I have logged numerous tickets and called to complain about my speeds yet nothing gets done. I even tried increasing my quality of service from them at an additional charge... All for nothing. For the past month from 7pm until 10pm I cannot stream any shows. I have a 100mb line and my line drops to about 5mbps. It is ridiculous. Why pay close to R1000 a month for such poor quality. I expect it to be rectified soon or by end November I am cancelling and seeking services elsewhere.