Vodacom airtime dissapearance.

I have been trying to contact customer service with no luck, bought airtime last week which just dissapeared and was left with no option but to buy again. Have been trying to get hold of a service consultant and the customer contact line gives me no option to get hold of a consultant and cuts me off instead. Covid or no Covid there should always be a consultant available to assist. I have a dual sim phone and its time I utilised that option as this is not the first time this occurs given how expensive Vodacom data is. Another mjor problem is that Vodacom uses my airtime for data once my data is depleted instead of blocking airtime usage. Appauling given the cost still.