Paying a ridiculous price for a 2gb data plan

I app**** for a wifi router at vodacom which includes 2gb data and 2 gb nightowl.I only use the router for my online gaming which in the past i used prepaid 2gb data and it would last me the whole month taking into consideration I only use the router on weekends due to working hours and activities on Saturdays.So this month is the first month i receive my bill for the router with my other bills and it comes down to my overall bill being R5108 and my next bill already being R2300 not even using it day to day.Once the data was finished on the contract i'm supposed to receive a message that says that my data is finished and have not received anything.If i have I would not continue to use the router as i know what the rates are for a MB.I am very cautious of my data bundles.I am very disgusted with Vodacom as it is the first problem i encounter in almost 2 years but it can be assured that i will not continue using the even though i am due for an upgrade.I'll rather stick to my current contract untill its finished and move back to MTN....