paid them and I still haven't received a resposlns

I received an sms stating an amount I 'owe' to mtn after they increase my 'limit' on a TOP UP contract. I spoke with layers and was advised to pay the amount as I did use the data or whatever. Which I have paid. I then get an sms stating my account will be active in 24 hours. Fine. I'm stall cancelling this contract due to section 22 of the CPA. I want a phone call. Not mtn stating they contacted me which is a lie. Send me the same email as always. You *******ly changed my contract with a signed concent form from me. Call me during 12 to 1pm or after 5pm. Not during my working hours. I will close this account and never deal with mtn again.