I think mellow never answered support tickets, about 2-3 months i've sent a ticket about removing links and still to the date i still have no response.
As I have seen, Mellowads always had terrible support. I'm not really sure that they are responding support tickets and emails at all. There is not many thing what you can do now. You can try to contact them via Twitter, Facebook, Skype or their bitcointalk account, but it's not high chance that they will respond.
Anyway, bad customer support is common thing in bitcoin world and majority of big companies have this problem.
Yep the same is here, too. I mailed them twice for a change in the settings and they haven't responded yet while BitMedia.io handled my request quickly.
Just forget it, you won't get reply from them.
Thanks everyone for your replies, that's unfortunate. I remember Mellow Ads used to have quite good support when they first started out. Looks like I'll have to work on an alternative solution.