Kaff Appliances India — Chimney repair

I had got my KAFF chimney repaired from your repair center 'SAI ENTERPRISES, GURUGRAM' on[protected], and was reinstalled fourdays later after paying 4500 as repair charges, but chimney has stopped working on[protected], it raises doubt about the quality of repairs and also whether repairs actually costs rs.4500/- . is there any checks on repairs undertaken by the Company . Please lodge my strong protest and get my chimney restored in working condition, other wise what is the point in getting it repaired from authorised service center and spending hard earned money on such " worthless service"