I can tell something, Ibchanged my email address a couple of years ago and when I visited RendobI changed it. I decided to go backbto Comcast for internet service and they gave me back myold email address. The problem was I could not receive emails and whie I gave up on the matter because they could not figure it out. Well I feceived a couple of calls from Comcast recently and finally talked to smebody and they asked to go and check my emails and lo and behold their was about 30 emails many from Rendo so you never changed my email address. even though I did. I am going to go back in to my account and change it back to the old one. What this had to do with the zip code problem I do not know. I am not going to buy the products because I tried to buy last week and now the price has changed.