There are garages that simply top up the A/C system gas and there are garages that do the job properly.
Done properly the system will be checked for leaks, it leak free will have the existing gas removed and then be topped up with the correct amount of gas/oil mix.
If they find a leak the garage should fix the leak before refilling with the correct amount of gas/lubricant.
If a garage simply tops up the gas there will be insufficient lubricant which will eventually wreck the seals and probably the pump leading to gas loss and pump failure.
Which did the garage do?
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