Unhappy client

I opened a savings account 4 days ago coming to notice my account has a certain amount of money missing with no explanation or notification via sms. I emailed the client service Centre they couldn't assist me. I visited Westgate mall Cape Town branch today and the teller couldn't give me any explanation instead she advised me I need to contact the call centre and they cannot call from the branch.

Firstly what is the teller doing in her position if she can't help me with a simple enquiry?

Secondly by moving my business to nedbank I thought I would get better service. It's clear it's not the case. I will move my business to a different bank.