Pack & play problems!!! 😤😤😤

So , I have 4 month old twins that have slept in the Fisher Price automatic rock & play sleeper since they came home from the hospital... The motor on the rocker part got really loud and stopped rocking. All it does is plays music and does not even vibrate anymore. I tried taking it back to Walmart but they refused to do anything about it. Any other moms have this problem or any suggestions on how to fix it without buying another one!!!!