Agresso/unit 4 compliance audit

We have recently been contacted by unit 4 regarding a compliance audit on the number of users we have compared to our contract.

The contract was signed in 2001 and has not been updated since and so we are over. 

I am awaiting a price on the cost of becoming compliant and I am expecting it to be significant. 

Has anyone else been involved in the process who can feedback their experiences?