Garmin Edge 705

I'm really unhappy with the service at Cape Union Mart in the Matlosana Mall in Klerksdorp and Garmin SA. I've taken my Garmin to Cape Union Mart on 26 Feb '15. They have sent it to Garmin and responded that my unit is irreparable. They said they will give me the 810 Garmin by making an additional payment of R 2 100.00. I've requested them to give me the 510 Garmin with no additional payment. It seems fair as this is a downgrade from my Garmin Edge 705 (the device that was returned for repair). Since my request Garmin had sent the unit back to Cape Union Mart with no explanation or reason. Thereafter Cape Union Mart sends the device back to Garmin and this time say my unit is out of warranty. Now how do they want to replace the unit for me the first time but the second time they say it is out of warranty?? Now I don't have a clue what's going on. I went to Cape Union Mart 3 weeks ago and they said they will follow up. After a week I went back once more to find out what is going on and they said again they will follow up and let me know. Guess what, I'm still waiting for the call.