Hyundai — workshop improper response

Address:

Bhatubasti, 744101

I had fixed my car ac last month on 16th august 2019 from hyundai workshop itself, with their spare parts of which they had asked me to pay in advance so that they will order it first and once it arrives they will do the fixing.
And today 6th september 2019 my car ac is again stopped working and has the same problem which has earlier.
What is the use of establishing such a huge workshop which does not even know how to fix a car ac.
What is the use of putting a workshop such big that it does not even have the proper spare parts of its own, that they always have to order it and for that they always ask to pay in advance.
Such a show off... Very very disappointment..