Pai International Electronics — I purchased LG AC ,but not at all cooling from day 1 I requested to replace but no one are responding

I LENKALA VENKAT NARSIMHA REDDY,
I purchased LG A/C 1.5TON LS-Q18CNZD
ACLG116,
Date:[protected]
From,
PAI INTERNATIONAL RAMATHAPUR -500013,
I went to showroom and asked to show latest model and good performance Ac 's then showed me LG Ac and said it is latest ok, I trusted them paid total amount,
Next day delivered and installation done, , But
From day one after installation done no cooling effect and faced much problems, and model also 2019 old version they provide me,
I asked to replace my product I'm not satisfied I said, but the paishowroom Guy rudely said whatever you do also we can't replace your product, just adjust with that product only service will be provided, I bought dis product 5months ago in this period they refilled gas 3Times and then they go away but no permanent solution shown to me, No one are responding properly to replace my product
I'm much worried because under warranty it all happening its OK, but with 6months warranty period will complete who will be responsible for it,
While we visit to pai international showroom today the guy rudely saying whatever you can do do we can't replace, dat's it
No one will come and help you to replace he spoken very rudely Really very hurting because Trustfully we went and purchased but now they are saying we are not responsible for that replacement
I asked why you send 2019model then he is saying that is only available but on purchased day he said it's latest model total manufacturer defect product has been sent to me, Sales guy spoken rudely, So many products purchased in pai international showroom but now no one are responsible,
Please I request to replace my LG A/C Product Immediately