Internet service is frustrating.

My Internet service keeps getting paused and I receive and sms stating that I am using out of bundle etc. This has been happening every single day for the past two weeks and when I called the call centre I kept getting disconnected. They only attempted calling back once and never again and then they send an sms saying thank you for calling the call centre. I am extremely frustrated because I bought a once off bundle and have sufficient data left but my networks just go off and I get the sms from telkom about my Internet being paused. I am extremely unhappy about the service and require assistance because this is totally unfair and *********.