Has anyone had a problem with their partner points from Sixt not posting, specifically Starwood (SPG)?

I have had private message and e-mail exchanges with 3 Sixt reps from this forum starting in August 2012. All 3 of them assured me that the problem had been solved and my points would post to my SPG account. However, I have not had any points post for my last 7 Sixt rentals between Dec. 2012 - March 2014.

I mainly rent from the ZRH station and always show my SPG card to the agents there because they don't see my SPG number in their records. The agents always enter the number manually and assure me that it is now in my file. Still no points post.

I was told by one of the forum reps here that I should contact Starwood to find out if there is a problem on their end, which I did. Starwood told me that Sixt had never sent the points over to them. On one of my calls to Starwood, they decided to hold a conference call between them, me and a Sixt rep. At the conclusion of the call, the Sixt rep said that he would send a request for the missing points, which still have not shown up 7 months after he made the request.

I have a Sixt rental coming up this week at ZRH and would like to get this resolved.