SHIPPING OVERCHARGES BY AMAZON / EVRI

I am horrified.... I have just downloaded my October Merchant by Shipping Label Invoice. Whilst I have never previously studied these in great detail I spent sometime to study this one as I have read on the forums that there are issues. The horrific's of the subject is that I am being charged twice for the same shipping order / labels . I purchased a label through Amazon on 30/10/2023 for £9.17 inc. VAT and on my 2024 invoice I have been charged for exactly the same tracking number an additional £10.80 inc.VAT. Furthermore, on the same October 2024 invoice I have been charged twice for another shipping order / label with the same tracking number for a label originally purchased 15/11/2023. There are also on this October 2024 invoice a multitude of additional costs ranging from £0.50p to £1.00 which is showing as a Service Amount. I am now ploughing through all previous invoices but in the meantime can anyone advise who to contact in order to challenge these concerns. I am also confused that the invoices are downloaded via Amazon and yet the invoice is from Grattan PLC in Bradford to which I can not find the relationship with EVRI.