Horrible service from 1st time client

I recently app**** for a online mtn contract and to my understanding Mondo is the one supplying me with everything as they did. When I received my statement I called in to query about my statement, I spoke with Amanda just basically explaining all my queries including tax and she cut me off just there telling me “I’m not here to calculate your tax” and then continued to be blatantly rude. All I was doing was explaining what the problem is. Then switched the phone off while I was speaking. I have NEVER dealt with such a rude person in customer service. The fact that she even has a job is astonishing. I then called back and and dealt with an extremely friendly woman who assisted me(Nondumiso could’ve been her name). Anyway I am still waiting for a call back regarding my complaint about Amanda as the manager was in a meeting at the time. Amanda’s service was completely unacceptable and I will be taking this further.