Incorrect Car delivered

I spoke to Penny from Avis on the 1st of November as I had to receive a Courtesy Car from Avis. She explained to me that I would receive a Group F (Family car) vehicle. I told Penny that the correct car I should receive is a Group G/H (Premium car) I even went and checked my Insurance Policy documents and confirmed my Car hire type was Group F Premium. Penny refused to log the correct car on the system. On the 2nd of November I received the incorrect car from Avis. Very appalled and disgusted by the service from Avis. Ive paid for a Group G/H car and I receive a Group F car. This unacceptable and you are robbing your customers Avis. Please ensure that the correct car gets delivered today 2nd November by close of business. 17:00pm.