Billing: How do I get a refund

I need help, I have been trying to get my account manager to reverse a charge on my account for services I did not request  the,  "Auto Charge"  for "calling credit package"
Below is the details of my plan--
Plan Essential--Details
Cdn $44.99
monthly per user 
Up to 20 users only

• Business phone or toll-free numbers
• Unlimited calls within US/CA**
• Unlimited Business SMS
• Voicemail-to-text
• Team messaging
• Document sharing

I am a small business and do not want to be charged for services I did get.
This forum is my desperate resort to get assistance from RingCentral.
Grace