Your total bill for the propretty should have been proprty price+10-12% broken down into 7% iva plus 4-5% conveyancing and legal fees.
This should have been explained to you at day one.
Example property price real= 200,000€ plus costs of 12% = 224,000€
Example property price with black money = 160,000€ declared value (YOU ARE STILL REALLY PAYING 200,000€) plus costs of 12%= 219,200€
The cash is for the builders back pocket (tax evasion)
you dont have to do the latter,just refuse but you do have to pay legal fees,i cant understand that you were not made aware of this.
I hope i have explained this a little better tonight,last night i was a little worse for wear on the vino!!!!