Mtn data contract are ****

I have a contract with mtn for 100gb data package with router, but my experience with mtn has been terrible. The allocated 100gb does not even last me for 31days whether I am using it or not when I check my daily usages you can see that it does not make sense it is cooked. I used to have a contract with cell c for 10gb per month and it used to last me the whole month but with mtn it feels like that 100gb is 5gb. If mtn does not stop this I will stop paying for this contract and go where I will get a value for my money