my tablet

I've been waiting for almost 4 months just for a quotation on how much its going to cost to fix the tablet... everytime i go to russells they call the insurance then its the same story over and over... they say they will sent it before closing time its happend 4 or 5 times.. I'm paying the tablet every month so its unacceptable because i cant even use it... it's really not good enough anymore.. its only excuses...