Vodacom thumbs down

Hallo. We recently had an encounter with Vodacom. My father which passed away had a contract with Vodacom. when he passed they wanted us to pay off the contract which was R18 000. after we paid the amount they also took the same from my dads bank account. which means we paid them almost R36 000. no one at Vodacom are able to help us to get a refund on the second amount that was paid. Its been 5 months since my dad passed away and still no help from Vodacom. After phoning numerous times getting put trough to one person after the other nothing has happened no one till this day tried to sort out this problem. disappointing!!!!!