May I suggest that we need to pay the upgrade of arena design, but not repay the whole amount for the arena design.
Say, I paid 500k before and want to upgrade to 1mil arena design, then I just need to pay the difference only, i.e. 500k in this example.
That would be more sensible.
Edit: For those paid repeatedly before, BB can check the record and arrange refund accordingly.
Last edited by HAHA at 7/3/2021 1:38:23 PM