Yesterday when the goblin rocket was released on console it was broken in that it wasn’t being rewarded after being purchased. This is why it was changed later on to a different troop that is working properly. Everyone who purchased the goblin rocket was refunded(or is supposed to be. There are a few discrepencies in that).
As for your pvp rank being reset I have no idea. It didn’t happen to me personally. I play on ps4, and I did purchase the goblin rocket. I don’t know if that has anything to do with it. Btw the devs for the console version are actually 505games, so if you ever need any support stuff go to: http://support.505games.com/support/
This is a related post about the goblin rocket issue: Xbox one goblin rocket purchase didnt work - #37 by Nimhain There’s no real reason for you to read it, but if you wanted to know the source of this information it’s there.