Refund deposited into wrong account

Hi There Just a heads up on Chase Car tracking ...This is by far the most ***** company to work with firstly ....wen i took out the cart tracker ...i was blatantly **** to by teh call centre aganet about the tracker ....wen i stopped paying teh premiums i was houdned with calls from them to pay ...after they have listened to their call recordings they have admitted they owe me a refund .....on the of July a agent called me to comfirm banking details they have confirmed details as the accoutn details they had on their system is old i have closed that account since ..,,new banking details were confirmed telephonically ....after not recieving my refund i called the finance department spoke to a lady by the name of Fathima , she had a dont care attitude tellign me that the money was depoisted onto my old accoutn and its my problem i must otu with my bank ....why call me me to confirm banking details , if u were gonna depoist money in the wrong account ....i have asked her to listen to the call recording that happen around the 25th /26th july ...she hasnt come back to me since 3 weeks ago .....Please can someohow elsae other than Fathima help me .....