Over the past two years, we've helped readers get thousands back in refunds and outlined their rights in our Money Problem feature. Today's problem is... I wonder if you could assist with an issue I have with Nationwide. In a nutshell, we attended a local branch to make a major overpayment to my mortgage (£70,000). This was meant to be a really happy time and milestone moment as it would have reduced my mortgage by more than £800 a month. The joy was short-lived as the mobile app made no sense