Merge 2 brands

I have inadvertently set up 2 brands in Brand Registry - they are both the same brand just the name differes slightly.

Tug-E-Nuff Dog Gear is one of the registered brands, we dropped the Dog Gear and have also a brand registered under our preferred name Tug-E-Nuff.

I now have a mismatch over multiple ASINs some differ from child ASIN to parent ASIN and need to get these 2 brands merged into one.

I have struggled to get help from Amazon seller support on this so any advice or help would be appreciated.