I feel so stupid.
So the technician just came and left. He said to me that the wall sockets don't work the phone has to be plugged into the router so he pulled out an adaptor plugged it into the router then the phone, all working.
I have to admit I was not made aware of this by any letters nor e-mail. More importantly, the call support centers didn't even mention this as she was performing checks for almost 25 minutes. That is a bit disappointing that she didn't mention this.
All in all I came here to thank Akua_A for the quick reply and support and the technician that visited was very helpful and upgraded some connectors on the box.
Thanks again.