If it's that urgent, your best bet would be to buy a new handset outright and request a refund for the other one. I know that sounds extreme but, as a business owner continuity and disaster recovery are your responsibility and it's always worth having a "what-if" plan. I speak as one who has had their main server decide it was just a meaningless heap of electrical bits. Can you perhaps go on using the hardware you were using before for a while?
This is a consumer forum, so all the Vodafone team will be able to do is pass you on the the business department, though it's also possible that they will be able to help.
A new device should work out of the box, of course, but that doesn't always happen. Yes, it's frustrating, but dealing with inconvenient occurrences and meeting challenges is all part of the fun of running a business. For mission-critical applications, I'd always recommend a suppport contract with a guaranteed level of service. That won't be cheap, so you have to balance the cost against what's an acceptable period of downtime.
