MTN Fibre with SuperSonic internet connection is very poor.

We have taken MTN Fibre connection few days ago for 100 mbps download and upload. but internet is very slow and poor. when done speed test it hardly giving 4 - 5 mpbs. This very poor internet connection. It is slower than 3G connection. Super Sonic is behind MTN Fibre Servies. I am disappointed with this. Hence, I request MTN Fibre to kindly cancel my connection without any charges and take away their router and Vuma Box. I am not happy.