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There may be a queue adding the data packs, if you have paid by card the money will be ringfenced as pending transactions and will leave your account the following working day.
You will find the top ups with show on your dashboard as a data pack, you should be able to queue up to 6 data packs at one time and should see the three data packs.
If you do not see the data packs, live chat will be able to make sure these are added and available for use.
I topped up 2 x £10 on Tuesday and 1 x £10 today but no credits showing at all and I cant contact anyone on live chat and my company mobile is not on the Vodafone network so I cant call the number.