So I received answer from support, guess what they said... The main idea was: "We are helping only with CLASS missions". So basically, the might be able to help, but wont do it because, by some kind of rules they are helping only with class missions. Imagine u just bought a car, something is broken, and guys from auto service telling u they are able to fix ONLY that, that, and that for example. "We are so sorry but we wont fix it, yes we CAN fix it, but we WONT".
Anyways some suggestions:
1. Allow Support guys to fix all missions
2. Let us replay missions. I guess lots of people will be glad.
3. At least block ability to abandon missions, that are currently hard to obtain again.
4. Increase missions limit to 30, at least.
I hope I did enough to help solving that problem. Situation could happened with any1.