Well as this is the DC forum, CO really isn't the issue. I assume you want points credited to DC. All you have to do is give it a little while to see if the points come through eventually and if they don't just send the Boarding Pass to DC.

There should never be a need to fake a seat change to re-register your number or a situation where you don't get points for a qualifying flight because you are given "the run around" by an airline whose frequent flyer scheme you are not a member of. You just need to let DC sort it out. If the flight is valid you will get the points eventually.

You definately shouldn't have any problems with retro claims for TK flights. There is another thread that clearly says that TK is not one of the airlines that requires airline approval for retro claims to be posted.