Billing issues

They over bill their clients and they don't show any interest when you complain, I had to struggle in order to get assistance and finally I managed to talk to them and they said I must pay R594 witch is for January and February but the entire February I was offline and when I enquire about it it that I paid for both January and February while I never had internet access the entire February I'm being told matter escalated just like before with the over billing. What is going on with Net99 will I ever have peace of mind with them