Bad service

My contract has come to an end. I have phoned several times & requested that the contract must stop & that I would want to port my number to Cell C pre-paid. The consultant said they will supply us with a ref nr, but we never received a ref nr. With the 5 call being made, they only supp**** a ref nr. ***. Today I received an sms that the contract continues, but just on a random other contract. I did not even choose the type of contract, Vodacom assumed that I will continue with a contract. I also had a huge problem with my billing & I had no choice but to pay. After months they paid a portion towards a credit. Vodacom South Africa is by far the worst company. I can't complain about their service, because there is NO service. They should make provision for a minus on their customer feedback survey.