African bank ****s

African bank called me to offer a pre approved loan or credit card. I accepted the credit card and they did a credit check twice ,i was told its approved and to pick up the card .when i did so i was told that they still need to call my work, i thought this is odd but fine .Now after paperwork has been sent credit card in hand i get an email that its not approved . I dont know what **** they are running but this is not okay.i didnt seek you out ,i used my petrol to go fetch something all your consultants said is a done deal. You have done credit checks that you confirmed are fine to then do such under handed work. Is it perhaps that i did not want to switch my bank to you that you would lie and mess up my credit score.