Avis/budget car rental has terrible service,

I booked a car online with budget /Avis for 4to 13 December,the day I'm supposed to collect the car they tell me that there's a R14000 deposit,mind u it's written nowhere this on their website or my rental agreement.nevertheless I eventually went to the montana branch and changed the whole booking.Now they're refusing to refund my deposit on time and they keep making silly excuses.At the same time they advertise book 4 days but pay 3 yet they refused to get give it to me.Avis/budget car rental you don't deserve even 1star,