No assistance with ***** on my credit card

Absolute shocking and inexcusable service from such a so called "renowned" bank. I reported ***** on my credit card on the 7th of May 2020. The ***** department proceeded to block and replace my card but, the lady who assisted me reported the card as lost instead of ****** which apparently would have sped up the ***** case. I was then informed that I need to report the ********** transaction to the disputes department who can ONLY be contacted by email and have no call centre number to assist on. What large Bank does not have a contact number for such incidents to be handled?? I have emailed the disputes department several times and to no avail, just receive a automated response each time with a case number. I have never received such shocking service in my life. In fact, the amount owed in respect of that ********** transaction will still be debited monthly and if not paid then I will be liable for the interest! this is absolutely disgusting. My next step would be to take this case to the ombudsman. All I am asking if for someone to attend to the case, investigate the matter and refund the money owed to me.