Dont bank with Absa

No service provided to customers. I have laid numerous complaints via mail but nobody responds to any of the case numbers issued. I am travelling overseas and need to make an online purchase. I phoned Absa to request OTP be changed from sms to email so i can make the purchase. I was asked to email RVN4U and request this to be done. RVN4U responded saying they are not responsible for the OTP and that it had to be done by a third party. I bank with Absa not a third party and expect Absa to resolve this. I have emailed numerous departments and obtained numerous case numbers but a week has passed and i have not had a single response. I am now considering changing banks. My wife banks with Standard bank and her matter was resolved instantly.