I want to update my GO720 by buying the latest version of the Western Europe maps. After backing up the device I removed the existing maps to ensure sufficient space on the 4GB memory card for the new maps. I used the Map Purchase on TomTom HOME, paid by card, but have not received either an activation code or other advice as to how to download the new maps. Thinking I made a mistake during purchase I repeated the process with the same negative result. I've looked at MyDrive, but cannot find the GO720 listed. Help please.