4 Months and still charging

I had sent a mail on the 09 of October 2017 to ********** with the forms attached to request them to close my account. As I knew I needed to wait 1 calendar month, I let it go to the 1st of December 2017 and got an invoice for January 2018. I called the helpdesk on the 12 of December 2017 and ********** asked me to send the original mail to him and he would let me know once closed. I did and followed up on the 19th of December 2017 and no response. Now I an invoice for Feb 2018?