I flew with Jet Blue on 3 July and the plane had a routing/gps malfunction that caused us to depart 34 minutes later. Once we got close to JFK the airport couldn't receive us due to air traffic congestion (as announced by the Captain) we ran out of fuel and ended up landing in Newark. By the time we made it back to JFK there were no flights available nor were there any vouchers for hotels. I spoke to the Manager at the Ask desk and she was very rude and confrontational (I recorded the interaction and willing to share it so that the lady can be retrained). We were told that within 7 days we should be getting an email if we qualified for a voucher, and I didn't receive anything. I reached out to Jet Blue online and they stated that the delay was due to weather, when it was clearly stated that it was due to the routing system. The online person stated that we couldn't land in JFK due to weather, and the Pilot stated otherwise over the intercom. He said to traffic congestion we couldn't land