Contract packages swopped

Last Year in November I was called by a Mobile Plus agent to give upgrade options on my MTN contracts Which I agreed to and received the devices and last week when they sent my minutes I noticed they swopped the packages as agreed with them on my new contract I contacted their call center asking that they reverse the packages to reflect on the correct numbers.The lady I was dealing called Joycelyn told me that they cannot offer me that suggested that I return the devices to MTN and cancel the contract.

While I was advised by MTN business call center that this can be done and Mobile Plus has the mandate to do it. Can I get assistance in this regard.