Night time data reduced.

I am very unhappy. I use to be a glocell customer. Ever since I was forcefully moved over from glocell to Cell C, I have had endless problems. Last month my payment was not acknowledged and it took countless amounts of corresponding to resolve. Then my call limit was taken away, which resulted in me having to drive out to a Cell C store to sort out. Now my midnight data has been reduced. Glocell had a special where they offered me 30gig night time data and 10 gig daytime data. Glocell then added another 6 gig night time data to my account at no extra charge. Now my night time data has been reduced from 36 gig to 10 gig. I am hereby informing Cell C that I will not pay my Cell C account until my night time data has been increased to 36 gig.