Mondo/ MTN biggest ********

I’m here once again my query is still not been attended, if there was an option for no star at all I would have done that. I don’t know whether I’ll say its Mondo or Mtn, but you people are **********. I returned the incorrect device which was your fault to the store about a month ago I have been billed for something I don’t even have. You guys are very good in sales but really sucks when it comes to resolving your customers issues, obviously I will be billed for the second time. Even when you call you hold for like 20-30 minutes and not get any assistance after that.for the second time Please assist with my cancellation request.