Don't get me wrong but question where people tend to buy established accounts rather than make there own normally means they have scammed and intend to do just that on another account.
I was being facetious but subsequently in an effort to be nice I decided to offer genuine help.
There is always a chance that language or an incorrectly filled out application could be causing the rejection.
I am following my genuine help with possibly self enriching help.
Karim,
We don't do that much with DS/Rook anymore but Simon P. is great to work with and very responsive.
His contact info is available publicly here: https://rookmedia.net/easy/
That being said if you can only park with one company - many parking experts on this forum would suggest
ParkingCrew.
We are by no means experts however ParkingCrew is our personal favorite and we do few hundred a day in revenue much of which comes from PCrew.
Here is my affiliate link to sign up at ParkingCrew and yes - FOR FULL DISCLOSURE - they do pay me a referral. https://www.parkingcrew.com/register.php?r=ac446ade649dbc77d3ea6e2c300d23d1d4ba811d
Good luck.
Sincerely,
Jeff