At my wits end with UC saying I'm claiming ESA

I have been on UC for over 12 months after my ESA claim was stopped. Fast forward to this month and my UC statement arrives with ESA being taken off. I queried this and was told I had an active ESA claim and was receiving payment and that if this was incorrect I needed to contact ESA.
I contacted ESA who confirmed I had no live claim and last received a payment in Feb 2023. I asked how then could UC say I have a claim and am receiving payment. The lady said she had no idea and would escalate.
Now 3 weeks later and with my next statement nearly due, UC are STILL saying I am receiving ESA and that to quote "The System we can see this information on is called CIS/Searchlight, Universal Credit are not allowed to contact ESA, and vice versa."

So I'm stuck in limbo with neither side saying they can talk to the other and therefore I am being deducted £ for £ a benefit I am not even receiving. I phoned up ESA again on Monday to escalate and was told a manager would call back but unsurprisingly no-one has.

What on earth can I do? I am totally up the creek next month if UC deduct a whole month's worth of ESA again!

I was on IR ESA for about 6 years. I actually have my appeal date for Weds over the way it was stopped.