Vodacom *****ing my airtime

Guys please be careful when you buy airtime please use it right away because otherwise you will find your airtime gone. I bought vidacom airtime on the 17/11/19 and i did not use then so today on the 20/11/19 i try to make a call i find that i have a zero balance my airtime is has disappeared when i call their call centre they claim my data was on not knowing i use a dual sim phone and my data is set under cell c not vodacom, i use vodacom sim for calls and sms only. They are *****ing from us guys