NATEK Programmer interview questions

Recently, I got a job offer from Natek for their client. I received all my documents and offer letter;Work permit too. After receiving, they were not ready to consider my profile because of my joining date and declined me. Later they came back saying they could not find anyone fit for the profile they are looking for and wanted to reconsider my profile. I agreed to this and they have sent my work permit. Since then I had my issue with my joining date as there was disagreement over it. After booking the visa slot, at the end moment they are stating the fact that they cannot hire,rejecting me (Just a day before my visa interview). This seems to be Gender and Location discrimination for me. Beware: If anyone from this company contacts you for any job opportunities via linkedin or any medium., kindly do not entertain them. They make all the false promises and ruin your career. Advice to Natek: Please respect the gender and culture if one is not polish. Kindly respect the time and money that is been invested and do not waste one's time, informing, JUST BEFORE THE DAY OF VISA INTERVIEW.