Ambrosis simply should ignore the demands.
Why because in law the burdon of proof rests with those making
an assertion. You are not obligated to engage
with some about an issue you believe has been resolved
or does not exisist. Only attend a tribunal if legally obliged
to you – have been sent a letter by the tribunal
If you turn up once again put the burdon
of proof on them furnish all receipts etc and
exact dates times.
If they persist in contacting you making unsubstantiated
demands as a last option after one written warning
inform them you may need to get a interim restraining
order interim ones are free but you need
to live with these people