Query number created on query number when complaining.

My mother passed away on the 01.10.2008. we informed Hosmed about it, and that there is no funds in her estate to pay the outstanding bill. We sent them her death certificate. the only response is one query number on a query number. She fell behind on her monthly payments due to the fact that Hosmed did not adapt her debit order. She filled in and sign forms to give them permission to adapt the debit order, which did not happen. She even asked them to put her on a lower plan and just continue which the regular payment until she is payed up. no response, just another query number. Her account was suspended 2 months before she passed away. The latest query number is 180520Q0PPP4 created on 18.05.2020. there is no funds in the estate to settle the matter.