OTP Registration

There was ***** on my card. The card was cancelled on my request. The card was reissued on time as promised. Then my problem started. I could not do any internet transactions. I went to the bank and it was sorted out. I requested to change the cell number to where the OTP must be sent to. I was at the bank twice and the number was not changed and it is still not changed. My question to the bank is: why must I go three times to the bank and spend 25 minutes on the phone with the call centre and the problem is still not sorted out. I can not lock into Internet banking because I can not get the OTP number