Vodacom Insurance

I've been trying to cancel my insurance on Sony Xperia since the contract ended however the number i was given never worked. Vodacom stores tried calling but nothing. I got transferred but no one answered. In the last 2 weeks the service was bad. Team Leaders were in meeting but couldn't return calls. All agents promised to call me back but never did except for 1 lady who called me back yesterday and today. I'm paying insurance on a phone that contract expired years ago. When i took out contract i asked for policy doc and it was never received. Chatz cellular tried numerous times to get hold of insurance dept but its like they don't exist. I would like it back dated and premiums refunded till when the contract ended. Worse service ever. Check all my calls and promises made to me. One girl called back, call got cut and did not call back. worst of all i need to explain story to everyone. also they needed to send forms, never got it till i called back next day and got more lies about cant send due to system problems and stuff. One girl even said she escalated to the Operations Department to investigate my claim but no ref number was given