Repair of stone wall

Stone wall in front of the house which is made from mix of concrete and stones starts to fall apart. Many pieces of stones are already ruined and laying around. i would like to fix this or to completely replace. Let me know the price for both options. Wall has three sides, two which are approx. 3 m and one which is approx. 11 m. Height of the wall is approx. 1, 2 m.