Poor service

I wanted to do an upgrade on my contract only to be told that my service was suspended with me being unaware. I paid the outstanding amount yesterday and when I called today they said my payment is not reflecting and I need to email my pop of which I did. 1 agent says 1hr the other agent says 2hrs then the last agent says 24hrs. The last agent tells me I only paid R500 of which I paid R946. I requested a manager callback the manager simply just gave me a missed call as I was sitting with my phone in my hand and it vibrates once not even allowing my phone to ring. Utterly disgusted with the service received since being a contract client for more than 5 years.