Mitsubishi

Ac still not working Invoice# 55723

I went Mitsubishi Service in Duluth to have my A/C fix because it was not cooling. They told me that part of my A/C was broken and they need to replace them causing me over $1, 200. Couple of days after they said they fix my A/C it was not working again so June 9 sent an email to the Manager that i need to return my car because its not cooling again. So they take my car and check and fix as what they said. I ask what is the problem, they said that they just need to add freon. But after a week the a/c is not cooling again so I bring it back again and they told me that another part of my A/C needs to be replace again and they give me a quote sheet again with over $400 cost. I ask them to give me the full refund of what I have paid already because they didnt fix my a/c. And they keep giving me wrong information of what really is wrong with my A/C
So i told the manager that why do I need to pay again when you did not do your job properly? How can i trust you that after I give another $400 plus my A/C will be really fix when from the very start you should already have told me?

I can provide copy of email, quote and invoice they charge me.