Over two months and still no response

This is the third time that I am putting a complaint in on this website, and quite frankly I wonder why I am wasting my time because I just do not get any feedback at all. I app**** for a credit card which has been approved, I even have the quote with a reduced interest rate, but still no credit card and I keep getting told that I have documents outstanding. Documents which i have been sending over and over again with applications expiring or I get told that my application is closed??? The person who is allocated to my complaint does not even come back to me. To get through to the call center is almost impossible and then all they do is say they will escalate the query or that i should call another number. for goodness sake, what does it take to get a straight answer here? Again I am wondering why I am wasting my time? So tired of this.