Grandson unwittingly subscribed 84-year-old to monthly service after being asked to add one-off top-up of £40

Last month, my 84-year-old mother spotted a £47.56 charge from a company called On Top Up on her credit card bill that she did not recognise.

When I looked into this, it emerged she had been unintentionally subscribed to a monthly mobile top-up service since September 2021 and had paid the firm just over £1,900.