Terrible experience

I have had a very terrible ordeal with Dis-Chem. All of a sudden, my online profile stopped working. I cannot access my benefits card on the app. Signed out and signed in again, with no difference. I tried to login on their website, it gave an error saying it could not load due to data mismatch. Sent their client services an email, and some guy called me yesterday (I could not catch his name as I was frustrated).

He informed me that there was an app relaunch on the 9th of February (which I did not know of as I had never gotten any SMS, email or even app notification with such information). He further said that they had changed service providers in terms of their database (only to later state that my information is secure), and that I needed to re-register and this is where it gets deeper. I tried the registration process again, and their security measure comes up (as it should) to let me know that there is a profile with the email that I had provided and says I should rather login or reset the password.

What annoys me is that the agent said I need to re-register, yet I am unable to register as I am already within their system. Even if one changes a database service provider, the information should be backed up and stored on the new database, and their front-end systems (app and website) should not be affected by this move. So all in all, I got a very bad service from their customer care. I cannot even make purchases online as the app redirects you to a web-page where you're still required to sign-in in order to make purchases. It is with this reason that I would even give them a 0 rating if it was possible