After savegame loss, no 0 Cr dlc cars anymore?

Hi

I have a problem and hopefully someone of you can help me to solve it.
I had to delete my savegame, because I ran into a bug on Storm Island. I’ve finished the main story, won the Horizon final, did all Show races, found all car meetings and most barn cars and played Storm Island to the 3rd tier after the 2nd gauntlet. Even with this progress and level 130, the game didn’t unlock all features of SI, such as car meet, bucket lists, except the first one, -all- online functionalities and rivals.
With a sad heart, i had to delete my savegame and start over again to get all Storm Island features.

Now i’ve won the championship in the Ferrari and decided to build up my garage again. The problem is, even i have only the Camaro SS and the Ferrari in my garage, i have to pay credits for all dlc cars instead get them for free for the first time.
My boyfriend who decided to delete his savegame too and someone here in the forum, based on his posting can get all for 0 credits again. So where is the problem and what can I do to get these cars for 0 credits, instead buying all of them?