NETWORK SLOW/UNUSABLE

In January 2015 I took out a 3G contract from VodaCom. Since day one I experience very very slow internet during peak times. 90% of time time the internet is so slow, I can't even open a web page in 5 minutes. Sometimes there signal but NO internet whatsoever. However, after 12am at night I get 10mbps + download speed. I understand there's peak times where the internet will be slower, but not to a point where the network is completely unusable. Not only can't I use my data, but even price on the contract I signed increased.<br> I trust VodaCom will look into this asap. Thank you