Nuisance Texts From Vodaphone

[Ringlet]

Vodaphone text me regularly on my pay-as-you-go mobile with rubbish information that I don't need (eg. Freebies, offers, holidays). These texts often come in at 1.00 or 2.00 in the morning, waking me up. I don't want to have my phone on silent at night in case my kids have a problem when they are out and about and need help. I have contacted Vodaphone to ask them to stop but they have ignored it. Is my only option to change to a different network? And is there any guarantee that a different network will show more consideration for the night-time hours?