Garmin's poor service and it's links with courier ****mers.

I bought a GarminDrive 61 4 uears ago. It started to fai***** a period of 3months early this year. I took it to the Garmin office in Rosebank and was told that it was irreparable and was offered a replacement for R2316.28 and having no other option I paid for it. I was then told that the new one was not available at that office but at the warehouse. I was promised that it would be sent via courier. Nearly 4 weeks later it hasn't arrived yet. But yesterday a company called e-courierboys demanded to be paid an outstanding amount of R15.99 before they would deliver the Garmin. Garmin said today that they do not use that company and that it was a ****. The question is: How did the ****mers know about the outstanding delivery including my phone number and other details? Now I am waiting for Garmin dedpatch to varify my order and payment. Question is : Why has Garmin not despatched my Garmin, why do I have to wait for the delivery and why is a varification necessary? I am wondering if I would have received the unit if I hadn't followed up. I think that the management of Garmin should follow up on the poor service and the link with the ****mers between Garmin and the ****mers.