Being summoned to Job Centre with LWCRA

Hello,

I look after a person with LWCRA (plus now awaiting for PIP form) and recently made changes to rental amount on gov website for rent increase.

 Strangely the gov worker did not understand that it was an increase and not a decrease of rental and did not accept the documents. They have called and asked to go centre with 1 day notice with no specific appointment time and no task note (they just said come in anytime from this hour and bring proof of address).

Can they actually make people on LWCRA go for the rent amount rectification even though they have spine problems on their medical record? We are thinking of refusing to go as this person seems to be doing it because she can't be bothered instructing us via notes.