Vodacom the biggest ***** out there

In November 2016 I signed up for a 5 gig package with a router with Mondo Mobile and agreed to an amount of R199 and to this day I am still being charged by Vodacom R259. Since January 2017 I have called Vodacom multiple times to raise the problem and each time after receiving no feedback I call back a few days later and find my queries have been closed and have been resolved but still being charged R259. Mondo Mobile has investigated my claim of R199 and said that is the amount I agreed to and have sent it to Vodacom to load a discount and correct being over charged since November 2016 but Vodacom has failed to correct this. I have not dealt with a more unreliable, unprofessional or ********* company after being a loyal customer for years that spends a small fortune with them and never defaulted on my payments. Looks like moving my business elsewhere is the only option as they could not be bothered to stop *****ing my money.