Vodacom poor service

Why ? Why ?

Been with vodacom for about 6 years . Everything went well . Had insurance on both phones . After all this time after upgrading at a Game store which i had a 2 sim phone . No where or no one ever told me i must only use the vodacom contract number in that device or im wasting my money and time insuring the device . Very conveniently after paying all those premiums i am told my claim is declined coz they can actually see that i was not using a specific number in that device. If they can see this why have not not contacted me long before to advise me i am paying for nothing. So when i call the number i was given for insurance and brought this issue up i was told to contact Vodacom. Is vodacom not the service provider i opened my contract with? Why must i get the run around:( How can Vodacom then give such a *********** company to do their insurance... Especially for the so called best service provider in SA... Lile really.... Well either way if this would not be resolved it leaves me with no choice but to cancel my contracts with vodacom .