Standard bank ***** line does not answer calls

I've lodged a ***** complaint at Standard bank and asked them to block my card but the ******* managed to withdraw 20000 from my card which was way over my limit . They said they will get back to me after 6 working days and its been a month and still nothing from them.l call ***** line but they keep me waiting for hours until my airtime finishes.Its so frustrating!!