Poor service

I have recently been contacted by the RCS to say that I have qualified for a credit card, after much persuasion I accepted by two callers. Their explanation was not clear as I have received my card via the courier, there is no instruction or anything of that sort in how should I activate the card. The numbers that are provided on both card and the app is unreachable. I require them to contact me advising me as to how I should activate this card.