Review Service aircond

Received quotation for service aircond for only RM65.after service, parts need to change. Charge another RM135.

Paid them RM200. Next day, aircond not functioning properly. Called them back said another problem and need to change parts.
Quote RM199 for parts and gas RM100!

From RM65 to RM499!! Not recommended at all. Should refund back my money or resolve the issue without any extra charge due to your staff faulty.