Need to change a version

 
HEllo, I bought a indicator for MT5 but its not working fine.. So I talked to the developer and he said that I would be able to get my money back and get the verson for MT4 instead.
I tried service desk but there is no option for that. 
Can you guys help me?
 

Nothing that we can do in the forum.

Contact service desk, ignore the available options, just use any.