I believe the reason it still has dollar signs and everything on the old channel is because you need to disable monetization on that channel not close the adsense account. I think that's the issue. So when you closed it, it closed the account so you can't make a new one. The way to get the monetization turned off the channel is not to close the account but to go to Creator Studio, then Monetization tab on left, then the bottom button says disable monetization. That will turn off monetization on that channel. That way you can turn it on and off of different channels without closing the adsense account since you can only have one account made. So if you can get the adsense account back up, then disable the old channel and then you should be able to put the same adsense account you had onto the new channel assuming that they will let you reopen the old adsense account you closed. Hope that helps a little bit.