The reason I put "wanna" instead of "wanta" is because, to me, in the new MV.. It sounds like they are saying "wanna." Just in case someone was thinking about that but didn't want to say anything.
My brother got all up in my case about it. "I'm pretty sure its wanTa. Like Fanta." Blah blah.
I don't like to spell it like that either because of the vowel shift. Since they're spelled similiarly, it makes one want to pronunce it the same. Then it's either "WONTA FONTA" or "WANTA FANTA", with the WAN sounding the same as a wide area network.