Extreme poor service Discovery bank

Pathetic service. Since June I'm struggling to sort out my Discovery bank app. App display message cellphone in use for another user. Several phone calls, emails, complaints NO effort from their side to assist. Two Incorrect persons linked to my Discovery bank profile. Ive contact them several times, email screenshots, submit correct details etc....no luck. Then a transaction for Apple watch is processed on my account. I phone them only to find out that the transaction belongs to one of the persons linked incorrectly to my account and that the persons card number is the same of one of my secondary cards. This happened on Friday, still waiting how they are going to resolve it. No feedback at all, 24hours later. Ongoing since June, I've got several reference numbers but no solution or feedback. They are not capable of sorting out problems and assisting their clients.