Request for Refund of $49.99 Due to Trial Mischarge

Refund Request. Hi there, I recently got charged after months of signing up for a trial. No email, no receipts. No invoice. I have used zero credits. Not used the service at all. Please refund the $49.99 charged. Email is manychattrial@gmail.com Otherwise, I will chargeback. Thanks. Edit: I was charged on Dec 7.