Best process to work with inherited lease transfer

Hello,

My mother inherited mineral acreage in Hughes and Pittsburg county passed down from both sides of the family. She passed away in 2024 and kept some paper records but not all. Her minerals were transferred to her beneficiaries and active leases have been transferred on all but one. I’ve sent multiple inquiries both tracked USPS mail and email. Several months ago I received one confirmation back on email that the company had adequate information from me and would process the transfer to the beneficiaries. Can anyone help me with a better understanding of how best to work with the mineral lease company to close out this final transfer? Your inputs are most appreciated. Joanna