Poor service

I have had funds missing from my account I spent some time contacting discovery bank to find out what happened to those funds, The agent Chule advised me to get a transactional statement from my App and to my surprise my suspicions was correct A total of R128,89 was missing from my account with no transaction to account for. This amount is not a lot but my question that I asked the agent was how many other people is this happening to. The agent told me he will call up his manager and ask him to assist, the agent put me on hold for quite sometime he then came back and he told me his manager will call me back I asked him to transfer me to his manager and his response was I spoke to him on Whatsapp, How unprofessional is that? When I first joined discovery I was so happy and recommended so many people to Discovery bank as I felt that the service was second to none but number 1. But now I wouldn't recommend discovery bank to any1