next time they will ask you the bank statements..and ask to come again after 2 weeks.by then they wil find something new such as marriage certificate or kids birth certificate..its what is happening to me..all i can suggest you is that do extend the visit visa if they are here without fail.else you will have to pay 200 per day and i just paid 17000..yes you are right..its 17000 what i paid for my wife and daughter for 40 days.i just dint extend their visit visa anticipating that it wil be transferred to residence permit.