Poor service, Day light *******

I have requested for help on the 13th April as I knew that I will not have money to pay for the router, but no one bothered to give a call back and when I call today as they have debited my account R595 with no connection they are telling me I should have advise earlier. If only they could have returned my call on time they would have known that I will not be paying April premium. Now they are telling me my account is owing, so my question is "what am I owing as I did not use your service in April". This is a reap off and you do not value your customers yet the money you are able to deduct but not offer them your assistance.