I contacted to add one top up, have since had three payments taken and no credit added, asked for £10.00 credit and was charged £11.89.I called the company and they told me to call Tesco mobile! I did and they confirmed no credit had been purchased.I was initially given the on top up contact details by the phone rep at Tesco … be aware !I have since contacted my credit card bank and left them to deal with this scam.