Mtn refusing to cancel my contract!!

Hello,I’ve been strugglixng for what seems to be months now to cancel a contract that was suppossed to have ended in may,ive tried calling each and every consulted refers me to another number which thry never pick up i’ve alsi been told to email even there i only got one response which asked me for my details after that nothing!! They continue to send deduct and send data which i do not want!