Deceased Estate, closing of credit card

I advised NDE of deceased estate, they accordingly closed accounts and transferred funds to E/L account. Thank you. This was prompt and punctual. HOWEVER, I never received final statements, although I was assured that they were emailed to me.

HOWEVER... my client has a credit balance on her credit card. NDE would not deal with this and gave me 6 different phone numbers to try. I have been ringing all 6 several times a day for 3 consecutive days. No answer or engaged. NDE says they can't do much more. This is extremely frustrating and I need intervention from somebody with clout.

I need... 1. funds from credit card paid to E/L account 2. final statements for deceased's MM/current acc and Credit Card. The lack of cooperation is frustrating