Vodacom avoiding canceling my contract. Just ignoring me. Do not provide reference numbers.

Vodacom unable to cancel my contract apparently. I phoned and they "lost reception" before giving me a reference number for the call. Next time i would have received a sms reference number that i never received. I emailed them and it is still not canceled. I do not know how to canceled it. it is 7 months now that i am allowed to cancel it and I had to still pay R359 a month because it is not getting canceled. Tried to stop the debit order but I am not allowed to stop it. Fnb said i need to let vodacom stop it.