Cancelation of Contract

So i phoned MTN customer care about a month ago, to cancel one of my mtn contracts, they told me to phone again on the 21st of November then i will be eligble to cancel the contract, which happens to be today, so i phoned them twice today which both times they transferred me to the Retention Centre , i waited around 10-15min both times for someone to answer the call, no one did. This is very bad client service, and as i did my research its a commen problem when people try to cancel their mtn contracts. Please do something about this