USELESS WHATSAPP AUTHENTICATION, USELESS CONSULTANTS

I have received an email with proof of payment attached. I called AFRICAN BANK more that 5 times to confirm if the email was from them; I could not get any help. They kept on sending ****** useless WhatsApp links that couldn't verify/authenticate. I told them I was no longer their customer, I paid up my loan, which could be the reason they couldn't verify.

African Bank is there no other number I can speak to a clued up consultant who will know how does an email from African Should look like, what I must look for before opening attachments from the bank. What a disgrace, the authentication WhatsApp should be revisited, it's annoying and useless when you are desperate for help .