Continuous overcharge

Since the beginning of this month I’ve spent close to R1000 on airtime and keeps depleting I’ve bought more then 3gig too yet my airtime and data doesn’t last. I have WiFi excess so it’s impossible to lose so much. For instance yesterday I bought a gig that is supposed to last 14 days and it got depleted in less than 24 hours. I’m really getting impatient with Vodacom charges, I’m a very reliable loyal customer for almost 10 years and I’m definitely terminating my contracts in August when I have to renew. I don’t recommend this “service provider “ to anyone, they never agree to being at fault nor fix their mistakes.