So disappointed on the Vodacom router data usage!

I would like to voice my frustrations with Vodacom. I took up a 10gig router contract to try and move away from the day to day exorbitant data prices . But to my surprise, it was the worst decision ever. Since inception of this contract, the 10 gig data only last for 2 days due to what I dnt even understand. I have an iPhone and even went to IStore to request for them to ensure that my iCloud is off ( which according to Vodacom is depleting the data) which they confirmed is. I’ve been calling Vodacom each month about this data problem but they keep on telling me the same thing or just give me some data on the router which also gets depleted in a day and this doesn’t solve the root cause of the problem. After giving me the data, they immediately close the quiry. What also surprises me is that I get 2 gig data on my main number and it lasts me for full 2weeks, on the other hand the 10gig that I limit usage on lasts for only 2days:( ??♀️ Something is really funny here. I’ve tried everything from going to 2 Vodacom shops and they were of no help at all . I’m in the verge of cancelling this contract, just to save myself from this traumatic experience. What should I do now, I’m so tired of calling Vodacom every month about the same problem that is never resolved! Vodacom, your assistance will be appreciated in this regard.