Iamgmparts Terrible business acumen Brandon Mississippi

Purchased a cross rail roof package from Iamgmparts.  I needed the item rather quickly and opted for the 2 day priority express shipping option at checkout.  a tracking number was provided and showed a specific timeframe for when the order would arrive.  The item did not arrive when promised so I called the company to see about getting the shipping fees refunded since it was guaranteed by the USPS.  When I contacted Iamgmparts, a representative by the name of Sam answered the phone.  When I asked about getting refunded for shipping I was told "I actually did you a favor by shipping the item to you 2 day priority express.  Our company doesn't offer that shipping option."  I explained to her that she could get refunded the shipping costs from the USPS and in turn refund me my money back, but she refused.  I have tried to contact her supervision but they have not returned my call.  A few days after this incident I received another package from this company, of which I had not ordered.  It had a 2 day express label on it which was the same label used to ship my original package only this company goofed up and sent it to me.  I have since reported this company to the USPS for fraud.  Also this company tries to make themselves appear as if their business practices are outstanding by deleting undesirable seller feedback on Amazon and Facebook, for which they have been reported.