MISSING DATA AND AIRTIME

I am a loyal customer of Vodacom and would not allow this matter to disappear into thin air same like other Vodacom customers who have lost their data with no reasons. I bought 250MB on the 13 of October 2017 strangely on the 17th I received a message from Vodacom that I have ran out of data, and airtime. Called customer care and was told I lost data due to internet, that was the most sad thing ever to only find out that the consultant couldn't assist me with a satisfactorily answer. Vodacom has given me and surely other users to change the network due to their unfairly treatment, data just disappear and nothing done its like normal situation. The only thing that can give me peace is getting my data back because, I am sick worried what really happened to my data even scared to buy data again.