Poor Client Service

MTN Cancellation department, seems to be purposefully placing people's calls on hold, who want to cancel their expired contracts. I have tried over 6 times and was busy taking with an agent and they placed the call on hold with music playing, then the call was cut. Called for the 6th time and whilst trying to explain to agent my situation, she tells me that I must call back after 1pm cause their systems are down. MTN can retrieve call logs to prove that these are not made up stories but facts. My contract has expired on 11 May 2022 and they have reverted to original price which is double what I was paying and debited this month.