Worst communication ever

I have dealt with many companies but Samsung is the worst when it comes to communication. I have the whole month trying to redeem the promotion tablet. I guess i am at a point were i think i just need to return their goods and get my money back. I've made phone calls, sent numerous emails until i got to promotions department, i was told to sent a screenshot of an IMEI number, i did. And they went quiet for the whole week, i called an agent again and asked him to tell promotions team to get back to me since they hardly return the calls. And i told him to get back to me via email because I work at a bank, i can't take calls during working hours. Until now dead end.