Worst ever customer service and humiliation I had with CITI BANK -DUBAI

I am a CITI BANK Dubai Visa and Master Card Holder since last 10 year and always make regular monthly payments toward my Visa and Master Card payments.
Since I am a bank officer in local bank in UAE I always remit funds through SWIFT MT 103 and it happened very often they pass wrong entries and credit both the installments of visa and master card payments in one account then call rudely to pay monthly installment again as they can not reverse their wrong entries due to system problem.
Once I delayed payment till end of month and upon received of call from CITI Bank Dubai told them you may charge me for late payment and the called in harsh tome replied " we do not need your late payment charges" then sent SMS on my mobile that they repeatedly requested me for minimum payment which I failed to do and as a result they are blocking my card.
I got Renewed Visa Gold card and did not activate the same due to their insulting behavior and unprofessional way of dealing like policeman with thief.
Last month October 2008, I sent my monthly card payment for both Visa and Master Cards and in November received phone call that I did not deposit minimum payment for my visa Gold Card.
When I referred my electronic payment which I already made, it was revealed that they deposited visa card payment also in my Master Card account.
Again they refused to reverse their entry and rectify the error instead threatened me to deposit additional amount for Visa Card payment.
That is harassment and the worst abuse to force customer to be suffered for bank's mistake. Then suddenly I got SMS on my cel 050-6286356 from CITI bank Dubai cel 971506454876 stating the same lies that despite their repeated requests ( I received just one phone call) I failed to pay the minimum monthly installment and if I do not pay by the same evening till 06.p.m they will take action against me .
I feel so insulted and humiliated and now the reason for CITI Bank's loss which is resulting to retrenchment could be understood easily.
I will never look to CITI BANK in my life for any sort of Banking and advise the same to others.