unacceptable service

I used the internet on the Vodacom network on the 5th of February 2018. Unfortunately, my airtime was depleted and not my data bundle. If I check my data balance, I still have data remaining, however my airtime was deducted. I called customer care and I received unacceptable behaviour from the Vodacom agent. I am not happy with this service at all. I have another contract with you guys and this number received R150 airtime this month, but this airtime is all but gone now, after a few short calls, so I decided to speak to another agent who said it was a subscription that was taking that airtime. The thing is that I asked for a report on this and I was assured I will receive one, but till today I have not received anything. So I have 2 issues can you please assist, I have no confidence with calling customer care, they just make empty promises, and nothing is done. I have the call centre agent names if you require this. Thank you.