Bad service from absa credit card *****

Good day, this is Mr Bouwer and I am not very happy with the way that my ***** case was handled. I received a call from a man claiming that he is from ABSA ***** department and that someone is busy committing ***** on my credit card. He said I will be receiving an otp pin and that I should give it to him in order for him to reverse the ********** transaction.The next moment a lady from ABSA ***** department phoned and stated that she is from the ***** department and that the call from the man should be dropped as they are busy comitting***** on my account, i dropeed the call but they still managed to take 15000 from my credit card acc. The ***** department managed to stop that amount being taken from my account but there was R 2500.00 that was still needed to be stopped as the ***** department could not stop that transaction. This Morning when i followed up with the ***** department i was informed that I will not be receiving this money back as it is none refundable because this was taken from my account due to my own mistake,. because i supp**** the man with the otp as per his request. How was i supposed to know he is the man was the ********. I am a senior citizen and have been a client of ABSA for many years. I am paying my accounts regularly and on time and this one time i am asking for assistance from ABSA they are not prepared to help me. this is unacceptable and unprofessional to say the least. they are eploiting senior citizen, take their money but when they are supposed to help they turn blind eye.