Is there something like withdrawal charges?
Don't pay them a penny/euro

This is a scam.  Cut all ties with this journal/company.  I've never heard of any reputable journal charging thousands (or even hundreds) to publish an article.

In the future google the journal name first.  There is also 

https://beallslist.weebly.com/

to help filter out scam publishers.

Rules of thumb for vetting publishers

1) Don't pay to get published.  Journals generally work on a subscription method where subscribers pay administration overhead.

2) If you do have to pay, it should be a conference paper with a date, and location.  Some conferences require that at least one of the paper's authors attend.  Be sure there are a date and city attached.

3) Paper retractions/withdrawals are generally big deals triggered by incompetent or unethical research practices.  Fees associated with this would obviously be a hindrance to accurate reporting by authors.

Edit:
You're not the only person this has happened to.  See https://web.archive.org/web/20130903150917/http://www.jfdp.org/forum/forum_docs/1013jfdp1040_1_032912094346.pdf