Cell C
No 3 g connection, and getting constantly worse

I am experiencing a loss of data connectivity after 18;00 in the evenings, at first it was every Thursday night. Now it seems like its almost every night. I have a 20 gig package for a reason, so that I can use it. I pay my account, but cell c doesn't deliver the goods, you are supposed to be the fastest network, but what does that help if there is no connection.