BlackBerry :: Playbook WiFi Does Not Work After Update

I purchased recently a second hand Blackberry Playbook and the first thing I did was a software update. After the update the device booted normally but it couldn't detect any of WiFi (802.11b/g) access points that I have home and in my work (3 different hotspots in total). I searched on the support site for the problem and I saw that some others have faced the same issue and they fix it by doing a full wipe out (factory reset). So I tried the same with no success, now my device boots and I am unable to complete the first registration that can only be done via WiFi. I also tried to re-update the device several times using the latest Desktop Software, but the result is always the same no Wifi detected.I contacted the Greek subsidiary of the store that the device purchased and they told me that I must contact with RIM central branch because the RIM support policy about this product (Playbook) is that customer gets support directly from them. The store that the Playbook originally purchased is Expansys France and I have scanned the invoice as evidence of legal purchase and valid warranty.Please advice me how can I get support for the product because I sent an email and the reply tells me that I need to submit BlackBerry inquiry via approved channel Blackberry Playbook wifi problem.