Dental appointment gone wrong

I was referred to Dr Widan through a friend when looking for a dentist in my area. I needed a cap placed, which was done. But in addition to this, Dr Widan redid a filling. Once the anesthetic wore off, the tooth was very sensitive to both cold and heat and caused me a lot of pain, which was not the case before. As Dr Widan only works Mondays and Thursdays, I had to reschedule a couple of weeks in advance to see her, just for her to determine that the filling had to be redone. I had to schedule another appointment 3 weeks after that to then have the filling redone. Today is Tuesday the 11th of May and my appointment to have the filling redone was scheduled for this coming Thursday (14 May). The clinic has just phoned me now to tell me they need to reschedule again, for the 25th of May, as they have shuffled around surgeries. I have been in quite a lot of pain for more than a month because of this failed filling and now, through no fault of my own, I need to wait another two weeks. I don't feel this is fair or good service delivery. I am frustrated by this process which seems to have a lack of regard for some patients. Surely there is a compromise that can be reached in this case.