Disgraceful Service

my contract expired on the 28 of april 2023. A call centre agent called me and i agreed to be on a month to month contract. When i decide to upgrade this year i was informed that i am on a 24 month contract and i must call 135. I have now dicided to cancell my 'contract' and was told that i must pay R113. which i did on the 12 of june 2024 i called 135 and was informed that that amount was wrong and they must investigate was i was put on a contract in the first place and they wil call me back. it has been more than i week and no one called me back. so i called 135 today waited, spoke to a agent and was cut off. this is not acceptable since the agent said that by last friday he will call me back with an outcome.