Discovery Bank migration from FNB

I have been trying, unsuccessfully for 2 months to open the Discovery Bank app. Due to the migration from FNB to Discovery Bank I was forced to open the account. As we had a secondary card which has the same telephone number listed as the contact when I tried to open the account I was unable to receive the OTP which would activate the account as the system identified another user as having the same cell number - my husband was contacted and his number was recorded correctly on the secondary card. Yet still I cannot activate the account. I have spoken to numerous people who are all very sympathetic and promise to escalate the query but that is the last I hear. I have asked to speak to a Manager and have been told on numerous occasions that my details have been provided to a Manager and they will call me back. Never heard from anyone. I could view my credit card details on the Discovery logon page but this no longer is possible. I am so frustrated as I was pressurized into moving, I did not want to do banking on my phone via an app but had no option ...and now not only am I being forced to transact in a way I am not comfortable with but I cannot open the account - why the migration took place without sufficient care to ensure that this kind of thing would not happen is beyond me...and now that there is a problem why is it taking two months to rectify. It is beyond frustrating!!!