Barclay Bank Credit Card — frequent harrasment on telephone for credit card payment

i m having barclay credit card no.[protected] of barclay bank.my outstanding was 11000/-
rupees& minimum amount 1050 rupees. but actual my transaction is around 7000/- rupees they are
increased this amount by putting late charges& overlimt charges. so i have talked there representative
that you please reduce this amount i want to do full & final settelment. beacuse i dont want to use this card. then he agree for full & final settelment. but this evedant occur 2 month back but no settelment
letter recived from there side. & every day there collection persons give me call & pressurise me to pay
minimum amount so i talk with them if i want full & final settelment why should i pay minimum amount.
even they talked with my wife & use abuse langauge. so please sort out yhis matter