Worst Customer Service EVER!

I have been sending emails to Avis customer care since the 13th of April 2018. I have even sent to two other email addresses I found on their website as well. I get read replies, which means they read the emails, but that is all I get. No one has given me an answer to my query, which is...they deducted two amounts from our credit card in March and April, according to us we did not use their services, so would like to know what it was for, but no answer. On the automatic reply it says queries will be dealt with within seven working days..well it has been a month now, and still no feedback from anyone.