Medipost and GEMS give me serious headaches

How do you get informed that you need a new 6 months prescription. You send it in, they send new prescription medicine and still send old prescription meds. I even talk to one of their employers and a Manager whould have phone me, I still wait. Next I new they will say they called while they didn't. Well if Medipost can bill for same sort of medication and not GEMS don't check, GEMS should never complain in overpaying. I am tired of try to save money for GEMS