Payment *****

I have a contract with Mtn. What happened is i paid my contract on time on the 2nd of may. After a week they blocked my fone saying im owing i did not pay. Then i went to get prove of payment at my bank. Then i went to mtn shop foe assistants they told me the matter will be resolved. But to my surprise it has not. My phone is still blocked they say im in areas. I have sent proof of payment foe several times but still it has not being resolved. Jst to think i have been the loyal customer to mtn since my first cellphone it pains me to receive such bad service. I disappointed. I even wabt to cancell this contract.