Telkom ripped me of

I took out a contract with telkom on November, it was a mobile router which was supposed to give 80gigs a month, 40 day +40 night... To my surprise on December, telkom cut me out on data while it was still on 50gig,it never work till beginning of Jan, instead of them giving me 80gig as they promised... Its started counting from 50gigs where it left of the previous month and again on 41gig I have been cut out, while on Friday I was debited R577... Am so disappointed I wouldn't recommend this network to anyone