Bad customer service

This morning I canceled my Mtn contract as it expired yesterday. The lady i spoke to said i will forfeit my airtime, sms and data that was part of the contract, but not the data that i purchased yesterday. As soon as my number went over to prepaid within 10min my data tgat i purchased was all gone. I then phoned the 135 number. When calling them they give you the option to speak to a service champion. When ypu press that option it says that it is a invalid option. I then phoned the mtn head office. Spoke to 3 different people. Almost 3 hours on my own airtime and still not sorted. Where this is suppose to be free when callig from 135. Can someone please help me.