I suspect the KCP bike is a so called 'Bicycle Shaped Object' (BSO).
BSO is a popular term for rather cheap bikes that are sold, for instance, via Amazon and supermarkets and often fail after short rides. Repairs are usually not feasible or economical. BSOs are targeted at the many riders who buy a bike to ride it once and then let it rust in a shed.
The answers to the question BSO identification for amateurs will help you to find out if the present KCP bike is such a BSO.