I can't change developer name

I found instructions on how to do this in the Amazon documentation; I have already created several tickets with a request to change the name, but since March 26 I have not received a response and the name has not been changed.
Tell me what should I do to rename the company in the dev account?

Hi there,

Thanks for posting! It seems we only received one case (15040092901) from you on Apr 1st and it has already been taken care of. Please let us know the case number if you have other cases waiting for assistance.