590a1, Mossberg Customer Service Issues

So, got my 590a1 in January. First Mossberg I've owned. The barrel, bolt, and mag tube had a bunch of rust in it. After calling twice and having to email a bunch of pictures to one of the service guys, they finally emailed me a label and I sent it back. 5 weeks later I get the firearm and they did not address the mag tube. Still full of rust. I contacted Mossberg again and the answer was; I could send the gun back for another 6-8 weeks, send the mag tube in and wait for them to send me a new one, or fix it myself. They were rather rude when I mentioned any form of compensation for my time. I didn't feel it was too much to ask considering I've had the gun for two+ months and had nothing but trouble out of it. Haven't even fired it once. Not to mention the options they gave me required a fair deal of effort on my part.
I'll fix the gun myself, not an overly difficult process but I didn't expect a name like Mossberg to have these problems. Anybody have similar issues in the past? Any advise moving forward with this issue? Any advice is appreciated. Thanks.