Useless call center

No OTP is received on my debit card online transactions anymore for weeks now. I went to FNB at The Grove, they confirmed my cell number is active and listed for OTP’s. They said I must phone FNB enquiries. When phoning FNB enquiries, I was instructed to switch my cellphone on and off, lost the call of course, she didn’t phone me back, I had to go through the whole mission again with a different assistant., she checked everything is fine and then referred me to the ***** department, The ***** department say they can't help and referred me back to enquiries, Enquiries refer me back to ***** department, totally useless service and ***********. No solution, problem not resolved, referred back and forth all the time from the branch to enquries to ***** department and going in circles.