I purchased my Btwin Triban 540 18 months ago. The two of the bottle cage rivnuts within the frame have broken. One turns with the bottle cage bolt and the other appears to be broken inside the frame. As the rivnut is part of the frame that is covered by a warranty can I bring the bike in for repairs? No decathlon stores are local to me, how long would the repairs take? could it be turned around in one day?