I shouldn't be suprised as my dealings with Voda in the past have shown them to be at best incompetent and at worst dishonest when it comes to customer service.
Recently, we decided to move my elderly mother from TalkTalk to Vodafone FTTC to get a better deal for her. She's had the same phone number for 60 years, but its so old that the number actually belongs to a different exchange to where she actually lives. When she moved 4 years ago (ony a few hundred metres down the road) she was able to take the number with her.
During the attempt to migrate to Vodafone, the online sign-up refused to handle it, so I thought the not-the-right-exchange issue might be it, so called Voda up.
A very nice man assured me repeatedly that they would be able to handle this manually, even going so far as to put me on hold while he "checked with his supervisor". I re-iterated that we only wanted to move if she could keep her number.
No emails have come from Voda in the meantime, but the router arrives. My sister goes to visit to plug in the equipment. When the line starts working, we call out of the landline - sure enough, the number has changed.
When Voda's call centre re-opens, my sister calls up. They claim that no such request was received to keep the number, although they agree that this was unlikely considering how long my Mum has had her number. They will attempt to migrate the number, but this "could take ten days". My fear is that the number will be re-assigned in the meantime.
I suspect that the nice chap on the line wanted to get the sign-up at any cost, knowing that the point at which the deception was uncovered, it would be too late and someone else's problem. Bastardo.