bad billing

in 2013 i used to have a contract with virgin mobile. i gave them 2 months notice that i was no going to renew the contract . the contract expired in december 2013. they kept on deducting money from my bank. we i contacted them they said its for airtime they loaded on the sim card.but i destroyed that sim card. i told them to stop [URL Removed] 2015 they have handed me over for r150.00.Virgin mobile must return the money they deducted from account.