I flew SFO->BOS->SFO->MFR->SFO between May 1 and May 10. All flights were on the same ticket number. The first three segments were credited. For the last segment (the most expensive incidentally), I cannot get the mileage credit. I filed two online credit requests in May and June, and called United: they promised to credit miles by Monday 7/25. The miles are not there! Is there a way to force United to credit the miles for the last segment?