Cable is too loose, so basically useless while driving

The cable I bought 50 sat nav for my Becker Ready. Fits. GRDS and it works. The price is reasonable compared to the original cable. Still, I'm not satisfied at all, because the cable from the outset is much too loose. It falls permanently below out of the Navi. This is very annoying when driving.

To fix the problem, at least to some extent, you have to attach the Navi so on the windshield that the end of the cable rests on the dashboard, so it does not ever fall out. But this is difficult and is likely to do in the long run is not good, but provoke a cable break. I have the cable only why not be returned, because I do not want to be as frequent drivers on the road without cord back for days. Basically, it is useless.

I probably spend more money and buy me an original charging cable by Becker.

If someone can give me a tip for an alternative budget car charger with integrated TMC antenna, which fits into my Becker Ready 50, I would be grateful.