Vodacom - a ******** organization

Vodacom refuse to allow me to pay the settlement amount on my contract - surely this is *******?? I am trying to do the right thing and cancel my account before i leave the country but Vodacom have made it impossible to do this!! After 3 weeks and several hours on the phone i finally received a quote which i signed and accepted but then a payment needs to be made which is impossible!! This is obviously done on purpose so your contract cannot be cancelled - ********!