I have a problem with my AC

Hello there, In fact I have an AC problem in my Mitsubishi Lancer GT 2008 Model; First time I went to check it they told me: your fan isn't working then I changed it and replaced the filter; after that the AC was working but not giving much cool air and since im living in gulf (temperature now around 45 deg) I went yesterday to another place; so he checked the AC gas and he told me that he refilled and he also removed the filter (surely when he removed the filter it was amazing: cool air was coming with low temperature and high pressure) then he cleaned with water. I drove my car then I felt like only one of the ac dampers (outlets) is giving cold air and the others are giving normal air. Today I checked the ac suction and discharge hoses and unfortunately the one considered for the hot isnt as hot as expected and same for the cold (normal temperature not cold) . In the meantime I dont know what's the problem. All I know that my AC isnt as good as I need taking into consideration that the AC fan is working in automatic mode ( working between two pressure limits: as I can hear the sound of its cutoff). Really need your help in this issue. Thanks in advance.