MTN Contract changes without concent

I feel have i have to start this post by stating that I have been a MTN customer for 17 years, joined them back in the day when they were still "the better connection".

Quite a few years ago I signed up for a data package with MTN, over and above the then 2 cellphone contracts already in place at the time. The package I was on worked for me, quite slow, but reliable and fine for browsing the internet or sending emails and giving the kid access to the internet on his tablet etc (think it was called Mtn lite or something).

Now, I have in the past, received a call to ask if I would like to upgrade, which I kindly declined. It worked for me, so why change it?

Tonight I get home to find that after my phone connected to the wifi, it asked for additional authorization. I quickly pop into my phones web browser to see if I have connectivity. I am then presented with an MTN site that tells me I have no data and gives me the convenient option of buying some. I then open my laptop to check if it's browser works l, but presented with the same site.

After a 27min conversation with the agent, she confirms that my contract had indeed run out of data. It turns out that, according to the agent, MTN decided that the product has now reached end of life and shifted me into the package that they feel would suite me best. Dear MTN, I was on the package that's suites me best, thus the decision not to upgrade. How are you able to simply make changes, without my concent or even notifying me of such changes ahead of time?