Mobile Router

I went to an MTN store at Menlyn to buy a mobile router. I explicitly asked if I can use any network and told them I only want the router and I’m not intending on using an MTN sim. They confirmed that yes I can use any network. Only to find that the router is Network locked.

I tried contacting customer care, no help they told me to go to store. Went to store and they basically told me there’s nothing they can’t do and they can’t refund me because it’s a cash sale. They wouldn’t even assist with escalating the issue. I’m so frustrated sitting with a router I won’t be able to use and I’m not getting any assistance from them.