contract with a bankrupt company

Not sure if this the right forum for this but our strata building (in NSW) entered into a contract for fire protection with a company that went bankrupt 4 months after they commenced.

Our EC (of which I have only been a member since October last year) are about to agree to a further $5000 worth of repairs making this years annual, 6 monthly & routine costs $12,000.

The building is only 9 years old and up until December 2014 paid about $4000 per year maintenance but decided this was too expensive so switched to this company.  Since then costs have been ever increasing.

When I queried the validity of the current repairs the “office bearers” did request some further information but ignored my concerns regarding dealing with a company that was liquidated 3 months into the contract but did not advise us.  All their accounts from October 2015 advised of a different bank account (big yellow sticker) but nothing else.

I did some digging which was when I discovered they had registered a new P/L company 7 days before a liquidator was appointed but used an almost identical trading name. On reviewing their invoices they moved from their commercial premises and have provided 5 residential addresses, 5 different phone numbers but retained their original website with the old company name.

This all smells of desperation and I wondered if anyone could point me in the right direction as to whether it is legal to deal with this company and/or who can provide advice regarding the legality of our contract.

I have avoided using any names but the contractor lists mainly strata companies operated by a multinational.

I hope someone has an answer.

Thanks