Had they agreed the reduced payment? Had they discussed it with their bank or informed them that they were planning to reduce their payments as a result of their diminished income? If they did so, what was the agreement in place. That would be the starting point for any discussion with the bank. If they didn't, then I would suggest as well as contacting MABS to look at the MABS website and start compiling their financial information in the manner indicated, this will allow them to demonstrate that the demand from the bank is an unreasonable burden on them.