Account Query: Incorrect Interest Charge

I know that during this time, many aspects either are on hold or take longer. Someone is still working in the accounts department however as I receive my account. Yet, there seems to be no way to query the account errors. I have emailed a month ago and received no response. I have been charged interest on my account twice when this is incorrect as you have a 55 day no interest policy. The only amount on my account is an interest charge and I want this reversed please. Is there anyone available to help?