Supersonic Accounts Department do not get back to their clients

I signed up with Supersonic in Nov2019 on a month to month basis. I also added a LTE router that I would pay off over 12 months.

Since Nov2020 I have been trying HARD and failing to get hold of the accounts department. I have called the call center several times and have reference numbers to prove it ... they tell me that they have logged the call to the accounts dept and that they will get back to me. Nothing!!! I have also managed to get the Acc Dept email address and have sent them an email... Nothing I have also rep**** on the email every 2nd day hoping to flood their inbox ... Nothing.

They take via debit order from my bank account and there is nothing that I can do to get hold of them. I dont want to just stop paying because I need the internet as my wife runs her business from home and disrupting the internet is not an option.

Supersonic Accounts Department please get hold of me!!