Where can I get reliable Infiniti air conditioning repair in Khalifa City?

I'm writing this while sitting in my car with the windows down because the air conditioning has packed up completely and it's genuinely unbearable in this heat. It's a 2016 Infiniti QX60 and the AC has been getting weaker for a couple of weeks, blowing slightly cool air at first and then nothing but warm air no matter what setting I put it on. I thought it might just need regassing, but a friend told me that if it's lost its charge that quickly there's probably a leak somewhere, and topping it up without finding the leak is just throwing money away. The other thing is the fan seems to be working fine, you can hear it blowing, it's just not cold at all, which makes me think it's something to do with the compressor or the refrigerant rather than the blower itself. What I'm looking for is <a href="https://infinitiservicemussafah.ae/ac-repair/">reliable Infiniti air conditioning repair in Khalifa City</a>, somewhere that will actually find the leak and fix it properly rather than just regassing it and sending me on my way only for it to fail again in a month. I've had that experience before with a previous car and it was infuriating paying for a regas that lasted all of three weeks. I'd also like to know roughly what a proper diagnosis and repair should cost, because I've seen prices ranging from a couple of hundred for a regas to well over a thousand for a compressor replacement, and I don't want to be quoted for the most expensive option if it's not actually necessary. Has anyone here had AC work done on an Infiniti in the Khalifa City area and been happy with the result? I'd really appreciate hearing what they found and whether the fix actually lasted. Any genuine recommendations would mean a lot because I can't keep driving around like this.