Not getting what I'm paying for

I was contacted by Mondo in November 2019 offering me a sim card with 2GB data for R99 per month. I asked the r sales consultant whether the sim card is compatible with any router as I already have three and without hesitation she answered yes...based on that I agreed to the contract with the understanding that i could use the data on my laptop. The routers I have are Vodacom routers, and the sim card does not work. I have been to both Vodacom and Telkom and their consultants verified this. Vodacom locks their devices. I contacted Mondo and was given a reference no:41059 and spoke to Jason Naidoo who logged my complaint and told me he would call me with feedback in 3 to 5 days... I'm still waiting... I called Mondo again and was told that after listening to recording of my initial call during which the consultant told me the sim would work on any router the feedback was that my claim is invalid. And that the sim card does work in any router.. Or i should purchase another router! I cannot use the sim card nor the data for which I paying.... This is unacceptable!