Incorrect Allocation of Minutes and Data

I was contacted by a representative from MTN regarding an upgrade on my current package. The package consist of 100 minutes, 1.5 Gigs of data however to my dismay i have been experiencing endless problems with the allocation of the new package. It has been a constant struggle to get the 100 minutes and 1.5 Gigs of data instead i have been receiving 50 minutes and 500 MB of data and of which i have been billed from the month of February. I have made numerous calls since the 27th of February to date with no resolution, I am utterly disgusted in the manner in which MTN has dealt my problem as a loyal customer from 2004 i expected better customer service. I hope that my query will be resolved in due time. I AM HIGHLY FRUSTRATED, PLEASE ASSIST!!!!