Paying insurance for nothing

On feb this year i went to mtn store to take a new contract phone it was my second contract because the first one was not insured it got stollen from work so i was paying simcard for my first contract.i took the second one and i asked the person who was helping me to insure my new contract , what she did she insured the old contract number instead of new and i never noticed that.so here in Dec i went to same mtn store to claim a new phone because i got ****** they told me the worse nightmare that the phone i want to claim into was never insured the number that was insured its for the old contract im done paying that one in september and thers nothing they can do.i feel like ive been ****** paying insurance for nothing im really ****ed off right now.i feel like its a day light ******* and that lady doesnt help at all she just taking the blame away from her.and she promise to call me back for more infor tilll today i never get a call from her.