Makro Bad Customer Service

I have purchased items on Makro and paid via Payflex. When I received my invoice from Makro I saw the amount that was paid during checkout and the invoice amount differ and have email them immediately when error was seen. This was 3 days ago and haven't heard or received any corresponce or feedback from them. Normally I don't check amounts upon checkout and rarely check invoices because you assume all is in order, but please people check receipts and also items purchase amounts. I'm not sure if my issue will be resolved, but this is unacceptable for a huge company like Makro. This is pathetic service!!