ahhhhh I appear to be ok ^^ still using a crappy phone >< but somehow a combination of getting into the play store via a computer which showed the app already installed on my phone and opening and closing the fanta page really fast in the play store app on my phone got me to see the install button long enough to mash it before changing to incompatible.
after reinstalling, i opened the app and got that same data corrupt error so went into my sd card and found where the fanta app data was still chilling and deleted it. over 600 files still there. anyway wiping that allowed me to reinstall and update just fine.
on a side note the fanta support got back to me about 8 hours after my email, so thats pretty good, although their response was pretty unhelpful. I assume it was just a canned response but i done fixed it myself so that doesnt matter.