If you have purchased TomTom from them, they should be your first call. It's their software. Did you read the customer feedback on the playstore? - 3.5 out of 5 with lots of 'issues' I would have walked away. Plus you don't say where you are from - how can anyone direct you? Type TomTom customer service "your location" in google - its a recent development but it works!
I understand why TomTom over Google, as the maps are on the device so saves data charges.
Personally I bought Co-Pilot - its brill.
Next if you S-offed and rooted then Google won't give you the free space - altered device. Should have read before you played. (or applied for the space before you played) You could revert the changes and apply.