Vanishing Airtime?

On 22/01/2020 and again on 03/02/2020, I purchased R110.00 pay-as-you-go airtime bundles using Standard Bank Internet Banking.

Both airtime bundles have been used up completely, despite the fact that I have not made a single phone call since buying making either of the purchases.

I also have a data balance of over 600 MB, so please don't try and tell me it's apps consuming data--which would be patent nonsense.

So, why is my airtime disappearing? This has not happened in the past!

I have proof of all of ALL of the above, and demand that Vodacom furnish an adequate and detailed explanation, failing which I will lodge a consumer complaint with ICASA.