I work for Vodafone* and it hurts to read these comments; making a hash out of something so simple. 
Don’t really know how to help as I’m sure that, even inquiring internally, I’ll get asked to send you to the same numbers you are using at the moment, (apart from Jeroen's).
Unfortunately Haggisman, I have to do this for internal project work too. Going to senior management for simple things. Despite being in a sinking ship, we used to 'get stuff done' for my customers back in the day with little fuss and ease. Big PLC's don’t steer at all.
I cant commit to fixing issues but I’ll have a dig around and trust message people having problems with any contacts I can find.
*Fixed line networks, not mobile; Vodafone took us over.

Don’t really know how to help as I’m sure that, even inquiring internally, I’ll get asked to send you to the same numbers you are using at the moment, (apart from Jeroen's).
Unfortunately Haggisman, I have to do this for internal project work too. Going to senior management for simple things. Despite being in a sinking ship, we used to 'get stuff done' for my customers back in the day with little fuss and ease. Big PLC's don’t steer at all.
I cant commit to fixing issues but I’ll have a dig around and trust message people having problems with any contacts I can find.
*Fixed line networks, not mobile; Vodafone took us over.

I'm sim only and generally go 12 month contract. Switched from Three to Vodafone last December on a business tariff. Had some issues setting up account including porting number and claiming the included Spotify subscription. Also local mast went down for 2 weeks a day after signing
Had to contact support on a few occasions as nothing seemed to work and just got the impression I was dealing with idiots. I'm sure there are many good people working for Vodafone doing a good job .... just, I never spoke to one of them!