I'm Being Charged For Returned Equipment

I let my longtime service lapse in October of 2021 because I was planning on looking for a less expensive provider.  When I decided to just restart service with Xfinity a month later I was told that I had to start new service which I did.  I went into the store and brought all of my old equipment with me since we were only using the xfinity app on Roku, didn't need any boxes and were being charged rental fees for all of them.  I received an account credit to take off all of the nonreturned equipment fees billed to my account and started fresh with my new bill dated 12/6/21 containing no equipment rental fees apart from the gateway.  We added a home phone line in July 2023 and for some reason equipment rental fees for five boxes started being charged again.  I have NO equipment apart from one new modem and one that I'm about to return and wasn't charged for boxes from December 2021 to July of 2023 so why have I been charged an additional $50 rental per month for the past 7 months.  I would like a credit for the amounts I've been charged and the equipment removed from the bill.  Actually, I want to cancel everything except my mobile plan and internet since my bill has crept up $150 since June 2023.