R60 airtime just disappeared

I bought R100 airtime last month in July. I have not used much airtime since then. I wanted to use the airtime I had left so I decided to log into My Vodacom app. I logged in to check my airtime balance, and I was shocked to see that I had just over R1 airtime left.

Where did my airtime go and why was it deducted? I never used any airtime and did not use it to buy data! Now I have no airtime and I had to get airtime advance to be able to make phone calls!

I spent a lot of money on buying airtime and I had hoped to save my airtime balance for when I needed it. I demand to be credited the airtime that was lost immediately!!!!!!!