Pathetic customer service - avoid using this Company

Unfortunately I can't rate this company zero. I hired a car with Avis via eBucks travel, due to the discount received. On booking the vehicle online, I paid for it on the 17th July. On picking up the car at KMIA I advised the consultant the car was paid for, which she confirmed. I signed the necessary documents and on the 24th September I was sent and invoice and changed again for the vehicle. I have tried to call customer care (calls go unanswered due to a high volume of calls, with the request to send an email and they will get back to you in 24 hours. Lies! Nobody gets back to you. 3 hours later after trying to get hold of someone to speak to I eventually speak to someone, and I am told to log a dispute. Today is the 29th of October ( a month later after returning the car) and no resolution. To add insult to injury the still hold a holding deposit - a month later. So I have a double charge for the car, and still have a holding deposit. Do yourself a favour and use alternative car rental services. This has been the worst experience. I wish I read reviews before actually using this company