Terrible customer service

I was offered a Mondo deal, with the option to cancel free of charge within 14 days. I contacted them within 5 days to say the router needs to be returned and contract cancelled as there was no proper service in my area. Took them nearly 3 months to collect the router, getting my address wrong 3 times. The one time they phoned to ask where in George they should collect, I am in Somerset West!! Finally got thr router sent back, and I'm still being charged every month for the last 3 months!!!! How is this acceptable? And try phoning? That's a mission! I'll never be a Mondo or MTN customer with this type of service