7 weeks waiting, now ignored by Sales administrator for cancellation

I signed a fibre contract with Oxygn Ballito after being promised installation within 2 to 3 weeks. It has now been 7 weeks with absolutely no feedback pertaining to the actual installation. I am being actively pushed around by Niloshni. Because of this massive delay, I urgently needed internet and opted to source another service provider, they are now refusing to cancel my contract and holding me at ransom. I hereby submit my formal complaint via this platform so they can release me with zero penalties as they defaulted their deadline by over 5 weeks. I emailed them three times and was ignored, I shall move over to the next step if they do not respond.