Vodafone Top Up and Get offers?

Signed up to Vodafone recently and signed up for Top Up and Get Web and Text. They texted saying I wouldn't need to top up to for it to be applied, so I should have been receiving free texts and 500mb internet usage on top of my credit. I sent a few texts and found I'd been charged.
Went on Vodafone website they said that any credit you had before signing up to the offer won't count, so will they apply the offer when I top up again
 
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