AIRTIME TAKEN with no SMS on Data leftover

Thanks for nothing, the agent that got back to me sent me just plain copy/paste **** without even understanding my problem. I buy data in small amounts 100mb at a time and use it to read news. NOW I did exactly that and never received an SMS like you should receive to inform you your data was either very low e.g under 20mb or depleted. I never got the sms and I can prove it as I have every sms from the date my AIRTIME was taken and I was not informed of low or now data leftover. This happend in July and an agent promptly returned my airtime but whoever got back to me has no damn idea on how to do their job proven clearly by their stupid copy and paste reply trying to inform me to turn of background usage etc. My problem is not background data usage or app usage as I have every one of those uncer control. MY PROBLEM IS MY AIRTIME BEING TAKEN when instead I should be informed that my data is low and that I should purchase another data bundle. What kind of **** just take your airtime without even informing you our data ius low. I cannot wait for ICASA to implement the new law forcing you to inform customers on low data @ 75%, 50% & 25% because clearly Vodacom does not give a ****. As I told the agent you have lost a customer and once my contract has come to an end I will be moving to another provider as I refuse to keep doing this every month or two because your system is so **** it cannot monitor what it should and inform customers with a simple sms.