[Observium] Multiple Payments

Hi, We're a subscriber to observium professional and recently did what we did last year and paid the £240 for renewal. The accounts department are querying that a further £180 has been taken out in the same month. I can only assume this is due to an auto renewal system. How do I enable / disable this, and how can we claim the money back since we seem to have paid twice? Thanks Andy Franks