Be careful when taking device insurance with vodacom and the airtime advance.

I have being the vodacom service provider for 19 years, and now am thinking of switching to another network provider after the bad service. firstly is this airtime advance, i took airtime advice and now they add it to my bill without them informing me that they will deduct it from my bank account not on my next recharge....secondly I have two contract with vodacom and insurance on one of the device, is happened that they stole one of my device and when i try to claim they tell me that they cannot pay because i have put another vodacom sim inside the device which is one of the contract sim. I took the insurance telephonic and the consultant did not explain to me during the call that i should not exchange or put the another sim in the device i have insured, which i find it very unfair cause the is same network. Now vodacom or insurance people are telling me that if i can not remember the name of the person who called me when taking the insurance they can not help me.

If i have changed the sim card why were they still taking my money for insurance.