Vodacom poor service

I recently called to cancel my contract and retentions offered me a package with a P30 lite, 175 airtime and 5gig data monthly. The person also confirmed that if I didn't finish the data it would carry over. Now I get the 175 airtime, my data balance is 0. This is why I wanted to cancel and then I decided to give your provider one last try and to be receiving such poor service.