ABS pump needs replacing

[kjb890611]

hi, I bought a used car and after a few days it was in the garage with numerous problems. after leaving the car with the garage for a few days, i went back today (a week later) after not hearing anything from them.i wanted to find out what was going on and was told the abs pump had been sent away and wasn't repairable and needs replacing, but he is struggling to find one. I don't understand cars or know anything about them. can someone please tell me what it means if they cant get hold of one. I have owned the car for 2 weeks and drove it for less than a week its been in and out of garage rest of the time.

I am hoping im going to be able to get my money back if they cant replace the abs

help please

[kjb890611]

sorry for limited info.
I bought the car from a car dealer, it is a Peugeot 308 on a 08 plate with 46000 miles. they gave me one month warranty. when I took the car back to the car dealer they sent me to a garage that does all there work for them.
the abs warning light kept coming on along with oil pressure warning, very loud fan and car misfiring.

[kjb890611]

I went to the dealer yesterday and asked for full refund they refused, I have given them until Friday to give me a refund or a different car to the same value or I will be taking the matter further.
i have let them know i have been to citizens advice so they know i know my legal right now