How long does it take to get an approval from mini for a brake fix?

I took my car in for squeaking front brakes, SA tells me the brakes have been glazed and that should fix the problem. I read the service report and it shows "complaint unable to be duplicated" or something along those lines. I drive the car after picking up from being in service for about 4-5 days and it still continues to squeak loudly. I was provided a loaner which made my experience pretty pleasant. After not being able to deal with the noise I call service and ask them if i can have one of the mechanics drive along with me so i can show them the problem. Get to the dealer, pick up a mechanic, drive less than a quarter mile and "BAM" the mechanic notices the loud squealing... Leave the car for service, i ask for a loaner and get denied, go a week without the car until i finally cant live without it, pick it up and have to wait for them to call me once the brake fix has been approved by mini. Another week goes by and nothing, I call to see whats taking so long and my service advisor is not available and wont return my calls... My service advisor has been great so far but i really would like this fixed.

Is there anyone else i should speak to about this or should i wait longer and continue to deal with this annoying squeak?