ok first of all im not sure 100% on this...what the thing that they service until RM250?? i only service aircond RM80 (cooling coil clean up + gas refill back + labour)..that's it...but i think the price is too much..recond compressor im not sure how much for kenari but my sis(iswara) change only around RM3XX but of course not include labour and all services..

since u say..
during day time, the weather is extremely hot, and when i got into car, i sweat like crazy even i on the air con.. the air con is not cool..
during night time, the car air con still ok, can feel the cool..

i guess maybe the aircond temp sensor?

i usually do service only price around rm50-rm80 only..this is totally ridiculous..btw...regarding ur "continue" case...leaking is always not a good sign..better go back to them to fix it..