MTN POOR Service!

I app**** for an contract by MTN. Then I wanted to cancel the contract because I could not afford it anymore. The lady that I contacted said that I have 7 days to still cancel the contract. She said that someone will contact me ragarding the cancelation before the 7 days are over. On the 7th day someone contacted me regarding the cancelation of the contract and failed to cancel it on time. Then the cellphone arrived to collect and I said that they must take back the cell phone because I canceled the contract. Now I am without a cellphone and are still paying for a contract that I dont want. This is unacceptable.