I bought a Fenix 5s plus Dec 2019. I kept having trouble charging it and had to keep buying new charge cables. As they only seemed to last about 3 - 4 months at a time. After the last one I bought didn't charge the phone any more I can now see there is rust around the pins charging. I bought it from John Lewis but they won't do anything about it. They just kept telling me to buy a new cable and they reimbursed me. Clearly there is a fault with the watch. It shouldn't corrode like that. Any advice please.