My wifi router's data disappearing

I took out a new wifi router and the very first few days with the device i complained about my data disappearing and the now defended the issue on automatic updates of my devices.The only thing they did was to offer me 1gig of data free for 3 months and to my suprise recently when i ran out of data i never got any notification on mydata to alert of my usage as if it feels like giving me notification it will.I happen to run out of data and as i recharged with 1gig of data it was depleted within 2 hours and when i complained i wasnt helped efficiently and i had 3 queries with different reference numbers and to my suprise i had asked to be given a feedback on the main number but my feedback was sent as an sms to a wifi router which i find unproffesional.Vodacom instead of actually try and see why my data disappear they just brush me off by giving me more data which i find not helpful as it also disappear and i came to a conclusion that im being ********** with a faulty device and its a total inconvinience as im running a business now i cant do anything im told to wait about 14 days to get a device and i cant continue with my daily business but they easy to take their money come payda