Sorry to hear of your problem. I have sent a few things in over the years with no problems and no questions so odd to hear your story. I recently bought a 5" with poor milling in the slide. When I called they simply sent the return label and warned of extended turn around times. No hassle return that I'm confident will be corrected by around April...not happy about that part! Being curious I called Ruger to inquire about their turn around times and was told that it had gotten down to about 3-4 weeks lately but was also out at 8-10 weeks at times.

Call again and see if you can get some resolution. Seems like you shouldn't have to go through hoops but I wouldn't give up on it. Unfortunately sometimes it depends on who you talk to. Being nice to the CS rep is always a good idea.

I know it is very frustrating but patience is your only option. Also I don't believe cracked frames are an issue with the M&P line.