[Resolved]  Voltas — Voltas ac which is not cooling after gas refill two times

Sir,
I purchased voltas ac 1.5 ton on 10th April 2022. But on 4th may I faced problem that ac was not cooling then I complained on 6th may on voltas my complaint number is [protected]. But we didn't get any positive response from voltas then I again complained on 10 may 2022 my complaint number is [protected]. After complain again and again voltas company technician came on 12 may 2022. He checked here and there then he said some leakage inside ac, I took it with me and resolve your problem in 10 days. But today (22may 2022) he comes with ac and he installed it and said there is no problem with ac and welding some external pipe and filled gas inside ac then said it ok now. But after 2 hour ac again gives hot air. What we can do sir??? On 10 may 2022 we fill gas by who installed ac. I refill gas two times. Technician said that its default piece. I want full replacement of my ac.