Poor service, poor network connection, ****************

Im having difficulty understanding how I can never use my data since I upgraded from 20GB to 60GB. I never experienced this problem on my first contract but now all I do is buy data while my contract data never gets network connection. I want to cancel this contract and your call center consultants are giving me the run around. It is day light ******* to say the least, why am I paying for something I can't use!!!!!!