‘Your data has run out’ Except it hasn’t.

I am getting automated messages stating my data has run out which are incorrect. I only realised they were incorrect when I got a message saying my data had run out 12 minutes after I topped up with 1 GB, and at no time had I been on 4G. I went into a Vodacom store where they told me I need to physically check because these are system generated messages and are obviously not accurate. I know how now to check my data to see whether. The message is accurate or false, but I’ve obviously been topping up unnecessarily based off inaccurate messages. This is basically *****, being wrongly deceived into believing I have no data so I pay for more. Absolutely ridiculous.