Very disappointed i am trying to withdraw from my pension fund but i am stuck because apparently some of my banking details are incorrect

Very disappointed i am trying to withdraw from my pension fund but i am stuck because apparently some of my banking details are incorrect. I had some help on Friday from a very friendly person but unfortunately i am still unable to withdraw. Keep on sending emails but i get minimum feedback. Been struggling on like this from the 4th of September. I dont understand why it has to be so difficult.