Mondly Charged My Paycell Account After Same-Day Cancellation

I signed up for a Mondly subscription and canceled it on the same day. However, the amount charged through my Paycell account has already been added to my bill. I cannot find a customer service representative or contact number for Mondly to resolve this issue, and I need assistance.

I do not understand why I was charged when I did not even have the opportunity to use the free trial period. I am requesting a full refund of the amount charged through my Paycell account and an explanation of why the charge was processed despite my same-day cancellation.