Terrible service

I have been receiving extremely bad service from Netstar currently. I have been trying to contact them to help me with my late father's account. I called customer services and emailed them on the 3rd of February, 5th of February, 21st of February and again on the 12th of March 2020. I received no response from them at all with regards to my matter. On the 2nd of April 2020 I contacted customer services and they told me they can only deal with my query after lockdown even though they are still debiting my late father's account every month. I find it unacceptable that they cannot assist me with my matter. I do understand that there is a lockdown but the amount of time I have had to contact them and have no response is completely unacceptable.