Internet Provider Double Charging and Denying It
I've just noticed while looking through my banking history, that my Internet provider charged me twice for 4 months between September and December (inclusive) last year. Normally the payments go out (via stored card, not DD) on the 8th of each month, but for those 4 months they also took the same amount, $79.90 around the 20th. the total overpayment is $319.60
I've contacted them and they're denying it based on there being no records in their billing system for those dates, but my account statements clearly show the deductions, with no corresponding credits to balance them out.
I fear they may have a fraudster in their midst who has successfully evaded their internal systems to track the deductions, and I may only be one of many who have been scammed.
What is my next course of action to redress this? Should I go to the police?