Livpure — Poor and 3rd class service

I bought 1.5 ton AC one year ago, livepure gives 3 free service but i got only 2 and in free service time period i complaint that my ac not give proper cooling but service provider says thats all ok, now my free service time period over than service provider says thats my ac's gas was leakage and gas was empty, and gas fill up charges is approximate 2500 to 3000 rs, why they could not chek my ac properly in my free service period.