Changing Normal Stash Tab numbering

I just upgraded a normal stash tab to a premium one and the game just randomly assigned tab number 4 as a premium tab.

I want my normal stash tab to be 1-4 but I can't rename stash tab no. 5 which is a normal stash tab to number 4. How do I change this? If I can't do this, can customer service change this for me?

Thank

Bump!

Is it possible?

Stash tabs can only be renamed if upgraded to Premium tabs.