Azure migration from Old Company that filed Bankruptcy

Hey everyone! We have a unique situation with a customer regarding Azure tenant/workloads. The customer has purchased a company that went bankrupt a few months back, and have inherited their assets which includes a SaaS product hosted on Azure. Microsoft has been sending them invoices for the outstanding balance of the Azure consumption under the old company which is still hosting the application (with active customers). Now they need to move to a new tenant under their name - which is where we are helping them, but they want to find out if we transfer this workload to the new tenant, will the balance be attached to the new company (even though we have paperwork that they have purchased the company)? They are considering moving away to GCP or AWS if it is attached, but we are trying to get them to stay on Azure. 

We haven't been able to get a straight answer from anywhere. We also want to make sure their application doesn't go down in the event MS decides to shut it off. 

Can someone guide us in the right direction to someone that can help us - the correct billing/legal/AR dept at MS to get the right answer? Your help is appreciated!