You need to put the routing code (it looks like ABC123) with nothing else and no spaces in the subject box. If you don't do that, your message isn't directed correctly and you get the response you have.
I'd probably be inclined to go direct to Samsung on this as they have it pegged as a known issue. Anything sent to Vodafone is likely to be passed back to them, just adding a middleman to the timescale.
The Watchdog piece mentioned people putting their phones on something soft, like a bed. It's generally not a good idea to put anything that's charging onto a soft surface due to possible oveheating issues (if only due to the insulation factor). A hard surface will conduct heat away for longer and is less likely to catch fire.
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