Struggling to use night data

I've got a data contract which is 1 gig day and 1 gig night. As soon as it come to the 15 th of the month we cannot use the night data even though we have almost 900 megs data. It's happening every month since I upgraded this contract. From the first day I had problems with this contract . First I was told that I don't qualify for the night data . Then I was told I do. Then I get the night data and was told I used it all up in 2 days even though I couldn't even go online. I'm really upset about this. As it can't go on like this. Even my voice contract giving me problems. I got a lot of airtime and yet my calls get cut and I get a response saying that I have insufficient funds. This is making me mad. It's happening alot lately and surely this is not on. Both my contracts is affected with your shoddy service. I can't wait for my contracts to come to full term so I can go to another network as that is how I feel at this moment. Your service really sucks and don't blame the strike as that got nothing to do with data and voice