my refund

I paid my money into DStv acct by mistake and I have been waiting for my refund since beginning of this month and they haven't paid me.my money ,I have send them all the docs including banking statement, proof of payment, nd my I D copy ant they said they will take 7/14 days but they havent done anything. it was amount of R5000 . I'm very disappointed . it was my rental money.im not even their client but I just put incorrect account number and it went through their account. they can see my money and promised to refund me been calling but they just promised me to.do.refund