Vodacom robbing us during hard times

I call vodacom on a monthly basis regarding my 20 gig data contract which never lasts longer than 2 weeks even if i dint use it when i chech balsncrs a chunk of data dissapears daily, they will send an sms to say matter has bern resolved without sny calls and close the matter now thet are charging me more thsnn the advertised R199 00 even for my contract and are claiming thst im paying for insurance which i know nothing about, my other account was due to expire and i was advised to cancel 1 September yesterday i was told it expired in December, my so called insurance wuery is now closed without refunding me for deductions over a year, tgey are robbing me abd i can't terminate due to penalties that are too high if i were to leave them