Only 110Gig of 1Tb contract allocated.. Can I pay only 11%of the bill?

Here we go again.. The only channel with a possibility for a meaningful engagement with MTN. I have 3 MTN contract numbers to my name. 1 is my main number and contract. The second is a number for a small data only package, and then lastly a number for a 1 TB/month I got in September of 2021. As far as I know, the contract is still active ongoing and nominal, except for the fact that only 110 Gig of the usual monthly 1 Tb was allocated to my number on the 12th of the month as is customary. No communication, or any thing from MTN as to why this has happened? When logging a call on the 083 135 help line, is like writing it on a letter, putting it in a glass bottle and hoping..