Betrayal series, unfaithful

On 28-08-2018 I send my watch for battery repair at the Menlyn Tissot shop I was quoted 1327.92. I asked that my watch must be send it back to me because of that was out of my budget. When I receive my watch I noticed that it's lighter than the way I know it. When I go back to the shop and report it the lady at the shop says to me there is nothing she can do because the watch was opened by the technician she is not a technician.