206 air conditioning problem

hello 206 I have 1.6xt
I have been going to the industrial sector for filling air conditioning gas for the last 3-4 years.
everywhere, the gasket is gone, the kidnapping valve will change, I have to give 100-150 lira.
He said he was missing the paint, he squeezed the color a little bit so I went to use it, I fixed the missed places, he said
There is a rustling noise like the sound of water, it does not cool again
What is the solution? Is there any service we can recommend in the Anatolian side?

Finding a good master has always been difficult. I hope your problem will be resolved as soon as possible.