why don't you publish yourself?
you can make the entire publicity by yourself today.
Using Google, Facebook, Instagram etc...
you really do not need anyone...
I myself got offers from an Israeli gaming company for publishing... but my gut instinct told me not to trust them as they are new to the market I ended up working with them for one month unpaid just to get the hang of publishing games.
what they do is they publish through google/facebook/Instagram etc, me and you? we can do it ourselves.
Have you tried publishing trough TGC? I did not take a look at TGC publishing yet but it also might be a good offer.
and one more thing I learned from that company is that Huge Product Businesses use several publicity agents and corporations so that their product will go on and on in several ways in several countries. SO NO INDIVIDUAL CONTRACTS ARE GOOD FOR ANYONE IN THE APP BUSINESS.
actually, I got like 3 or 4 emails right now from companies all over the world that wants to publish (Pay per Install) Mini Math X (Android), I hardly take a look at them as they seem like bots or something... you know... lurking for new apps on google play and app store just want to "We love your app! and we think its the best why don't you pay us so we will push it forwards towards everyone everywhere ..." haha I honestly don't know who to believe...