BookKeeper Full Stack Developer interview questions

There were 3 round . 2 were related to programming and 3rd one was related to logical . I cleared all 3 round and they said they are going to give me offer letter but after 3-4 days when I contacted through call they didn't receive and when I mailed them and asked about offer letter they said I didn't clear interviews. Small company no professionalism at all. Join only if you don't have any other option