Pathetic communication

I'm very dissatisfied with the type of service that such a well known company has to offer, its been over a week and i haven't been given back my deposit, I've emailed them thrice so far, called them good number of times for which i was only gotten through once, selected the department for deposit/refunds and when someone answered (will not disclose his name here, however all details available) he just said to me after taking my invoice number that he will get someone to call me soon, I've been waiting an entire day and no call.

Very unprofessional, I've always used avis and europcar, had some issues but always available to call and get assistance, however this one doesn't respond to emails/calls....