So over bad service

I just left the store literally in tears. I have never experienced such bad service from a contact centre. While querying my bill which might I add has still not been sorted, and explaining my query for more that ten minutes. I ask the a gent to hold so I can get a pen. She places me on hold for more than 20 minutes probably hoping I would hang up. Eventually someone answers from the sales department and I request to speak to a manager and get placed on hold again for 15 minutes. Now I work in a contact centre and would never treat any customer this way. I wonder if this is the way Telkom expects customers to be treated. Utterly disappointed and appaled and still not serviced.