AC not cooling properly, need affordable gas refill near Khalifa City


My car's AC has been struggling for a couple of weeks now, it's not completely dead but it takes ages to cool down and then loses its chill the moment I stop at a signal. I'm in Khalifa City and I'd rather not drive all the way to Mussafah or the city for something that might just be a gas top up. A friend mentioned Affordable car AC gas refill and compressor repair near Khalifa City but I didn't get the name of the place and he's since travelled. What I'm worried about is a shop just refilling the gas without checking for a leak, then charging me again in a month. Has anyone here had a proper AC diagnosis done locally? I'd like to know if it's worth paying for a leak test first or if I should just get the refill and hope for the best.