Avis/Outsurance - non delivery

Avis branch Loveday Street Marshalltown has still been 1) unable to deliver a replacement car 2) follow up 3) return my calls Since wed 16 October. Thurs 17 October and today 21 October. Outsurance (under whom this facility was arranged after my car was ****** 15 Oct) also unable to advise/resolve/ return calls