continued deduction of Carers Allowance as unearned income when claim has ended

Cl notified CoC on the journal that she was no longer caring for her mum
Carers Element was removed but deductions for carers allowance continued until I queried it last week.
Casemanger said claim showed ‘suspended’ so would still be deducted
Cl had last CA payment 12/8, she called CA last week (and again to confirm) they closed the account on 5/11 but dated end of claim 12/8.
Case manager is stating the claim shows as ended 5/11 so they’re refusing to amend until cl gets the letter from CA confirming the end of claim as 12/8

I’ve had similar with a MA claim showing active but this was resolved following a call to MA - I’m unsure the of the practical process of how their system would update to show the correct end date?

Is there something specific I can tell the casemanager to do to confirm without further delay?