Disgusted service-Tempest

I've rented a car mid June 2018 and 28 June I've received a tax invoice. It' s been weeks now already without any refund or any update from the consultants on why everything was prolonged. I had to call customer services last week Wednesday ,4 July 2018 after not hearing anything and the lady informed me there was a problem with the machines and I went crazy because why didn't they inform the customer in the first place ? Yesterday, again I had to call and ask how far is the process. I was informed one of the manager's didn't signed the form yet and therefore no response from the finance department. This is the most disgusted service I have ever received. Still up until today no response or follow up to inform me what is the latest feedback . Disgusted I am in Tempest and I won't make use of their service ever again!!