Useless service and undue stress

About 7 months ago i opened my business bank bank account with Mercantile and from the word go I had terrible service things were not done right and the account was a shambles. they got my number wrong and so on. i then requested that my number be changed to the correct number they then sent me forms for change of details and subsequently nothing was done. still to this day the change of details have never been implemented and the incorrect number is still in use with the effect i do not receive my OTP codes but in the beginning i was receiving them through email. I have thus been told that all OTPs are sent via SMS which i do not receive due to the incompetence of which ever apartment dealt with my query I am a very unhappy client and this is causing me undue stress and irriatation . it would be greatly appreciated if a manager would be in contact with me to sort out this issue going forward. I need to pull PODs so this is extremely urgent