Bad service

About 3 months ago I took a Daniel Klein watch to be repaired . just the straps. To the same store where i bought it . after 6 weeks a was called to collect . while collecting it the store assistant dropp the watch right in from of me . when. I had a close look at the watch i found that the glass had a crack . after much debate the store assistant said he will need to send it back for repairs. After 3 weeks i got a call saying that they cannot fix the watch with a gold face. Which i did not accept. Later the store manager calls telling me she can only give me 10% of what i paid for the strap. I explained to her that that is not acceptable as my watch was 100% when I gave the watch for my Straps to be fixed . I need assistance regarding this matter urgently.