Xfinity Support

Hey I’ve been getting charged for equipment we’ve never received or had with our plan and have been getting charged for years. A long time ago when I was late on payment I brought it up asked what it was the employee wasn’t understanding me and said it was an activation fee every month so that’s what I thought it was but now looking again I’ve been getting billed for equipment and it was never fixed. Is there a way I can get credit for that because I’ve lost a lot of money for it.