MTN moves the goalposts....

MY contract expired 18 months ago, and has been running as a month to month since Sept 18. My 350 minutes and 500MB have been regularly credited until November 2020. All of a sudden MTN felt it was ok to no longer provide me with my 500MB data, but my monthly subscription didn't change. So apparently I now have to pay MTN more to receive the same services I had always been. No notification, no advice nothing. Having logged numerous complaints and queries, I just get told 'it was a promotion and has expired'. This has also happened to one of my colleagues, three years after moving to a month to month contract. Have no fear MTN I shall be taking my business elsewhere after 20 years of loyal custom!!!