4 months waiting for contract cancellation

Since December I requested a sim swop and 4 months ago I requested the contract to be cancelled. Still today Im sitting with problems rather than solutions. I have lost business due to a none working number. I even went as far as writing an email direct to the CEO's of this company but nobody has bothered. The law of South Africa buffles me as I fail to understand How do such companies operate in the our country..We are being ****med