Upgrade Ransom- They'll shove an upgrade down your throat or you lose your phone number

This morning I received a call from one of their call centre agent , saying that she was calling on behalf of MTN for one of my contracts that EXPIRES by the end of this month (May 2024) whereas I know my contact period ends in August , she then proceeded to offer me a new package at a lower price, then I asked her is this the month to month option (similar to an option I opted for on one of my other number, where I can keep the number on my account and upgrade at anytime) to which she rep**** that I have a contract SIM and can't switch to that option, then I asked if i can remove my number from my account and continue using it as pre paid to which she also said no and also said if I don't take a new package my number will be recycled ,to which I rep**** that are you holding me at ransom (because that's what it felt like , I had 2 options either take a renewed package or lose my number) and she abruptly just dropped the call thereafter. Extremely disappointed with this behaviour