Bought Maps,Updated it but updates lost after a month

KapilG Registered Users Posts: 6
Apprentice Seeker
I had the SatNav in my car which was not updated since 2014 and hence it did not show certain streets or ways made after 2014.
I bought Australia maps for one time cost of 90 and updated them in my car.
I could then see the new streets and ways and confirmed it
However after a month I again lost those updates.i tried reinstalling the same map after removing it from my device..Did not help.
Has some faced this problem before and how to solve it?