Johnson Lifts — Amc is bad

We have done comprehensive AMC with Johnson lifts for last 8 year, since the lay lift is launched in our appartment. Since the day one they have only cleaned the lift and done oiling . Now when the lift is getting old, and the part needs replacement, they are not doing so . .even after doing compolaints from 8 months they have not done anything .
Till date we have paid 4 lacs for brooming and oiling