Mondo **** to me now wont refund me

A Mondo sales consultant phoned me and sold me 2 x 2GB package with free WiFi devices in October 2015. I was assured by the consultant that we can use 2GB data on our cell phones, and she had complete list of my family phones and numbers. After making sure with the consultant numerous times that I was able to use the 2GB data on my cell phone, I signed 2 x 24 month contracts. When testing I discovered they **** to me. I called Mondo in Nov 2015, they obtained voice recording then phoned me and agreed that agent had not told me correct facts, and promised to cancel the debit order, and refund me, and only charge me for Megabytes used whilst testing. They colIected 2 Wifi and SIM Cards from me by courier. It is now March 2016 and I have STILL NOT received a refund. When I log call with Vodacom they keep closing it, promising to get back, but never do. This is misleading sales and I want a refund NOW.