I have tried top -up by 02 voucher but it says the voucher is invalid
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you have to try it a few times.
they normally do this at first.
itll go through eventually.
You have to keep on trying it will work for sure or dial 43430 and topup from your phone
O2 vouchers sometimes take 3 or 4 goes to go through so keep trying, it will work eventually
Keep trying it - it should take eventually
keep trying it will work eventually