Payment plan issue and line suspension

With xfinity mobile since 2014. No issues with line termination or suspension. After illness and an accident end of 2022. Called for payment plan. Told the plan date would start Dec 24th. Make a payment prior to the Dec 24th date. On Dec 24th, no plan payment was taken out. Called and told by rep. Plan date was Dec 30th not the 24th. On Dec 28th my line was suspended. I called again and told by rep. Plan date was not Dec 30, it was Dec 24th. Asked to make a payment then, was told it was too late. Asked to speak to someone else. I was then told I couldn’t do anything until after 6 months had past. It doesn’t make sense. How do I rectify this?