Data is ridiculously expensive

I've been a loyal customer for well over 10 years but recently I've noticed their pricing is ridiculous especially with the data. I buy 1 gig for 30days or so they say but it gets used up in a day. Even my whatsapp 1 gig supposed to be 30days but within a week or 10 days it's used up. Where as I used to use vodacom and cell c and my data would last till maybe 2days before the expiry im going to migrate to another cellphone company due to the ridiculous rate on data.