We just walked out USCIS Office, explained to her what i told everyone here, we gave her a letter withdrawing form i 485, then gave us a letter explaining the refund process, also gave her the new form i-824, reviewed it and sealed it, gave us a letter that they have the form and said just wait for letter in the mail for interview date.
It does not work like that... File will now need to be transferred to NVC (+/- 1 year) then beneficiary/petitioner will need to complete personal and financial info, which will get them documentary qualified (DQ) (several weeks to months) then NVC will send to Manila for scheduling an interview (no idea what the wait time is for Manila).