Hey wonky,I’ve had no problems whatsoever with Ovo so not yet tested their customer service.On the monthly bill you get it just says Charge Anytime and gives you just the amount credited back,nothing else regarding dates or ev usage.I keep track of it just by writing down each usage and working out the full charge at peak rate,then minus the Charge Anytime 7p rate,thought it best to do this as it is simple to pick up on any discrepancy on the Ovo bill.You get credited the difference back the following month but cut off date is around the 15th of the month so if you did a charge this month after the 15th you would not get that credited back until your June bill.I suppose the big test will be if/when any problem occurs and how efficient Ovo are at dealing with it but all good so far.