Does the regular service guide on your Mazda include aircon maintenance like flushing the oil and the gas? If not then that's where the problem is, coz most people neglect doing aircon maintenance until its too late. It's better to do aircon service every 40k km. I just did on all of my 3 cars for a total cost of just rm220, surely better than risking thousands of rm repair work like yours.

Well normally they should have a machine to do that. If you never service then surely it will get spoiled because the compressor is just like a small engine with small pistons inside that requires oil to work properly. That oil surely also will have its lifetime. So not servicing or changing that oil is like never changing oil on your car too, definitely will spoil sooner and you'd need to fork out thousands to repair your aircon system. I'd rather spend rm60-80 every 40k km to maintain it in good condition rather than spend thousands later. Anyway for mine, I think the workshop did a good job at a very reasonable price. After service, the aircon of all 3 cars immediately feel colder until can fog up the window.  By doing this I never have any aircon issue/compressor spoiled during ownership of various cars for the last 20+ years. The last time I had to replace my compressor was in the early 90s when I was like most people, before I knew that such maintenance is necessary.

Is Damn simple  but lazy ass fucks  don't bother

You just vacuum the entire system for 45 minutes to check leaks , remove moisture , drain all old gas and refill according manual by weight

Quick Google will tell the refrigerant amount , once reached thst weight , done .