Worst service up to date

Worst service ever experienced. Changed contact number 3 times in 3 weeks yet still get OTP sent to old number. After numerous calls we were told that OTP department would contact us to change it and a week later still waiting for it to happen. Each time we phone the consultant gives us another story and advise us that a ticket will be escalated. The credit card was upgraded 3 weeks ago yet no transactions can be done online. It’s ridiculous