Sometimes trying to fix someone's car as cheaply as possible brings about certain risks to the repair facility. You may want to consider, these guys might have tried to take care of you as cheaply as possible and didn't get it right the first time.
Cars are complicated machines.
I know this might not sit well with you right now, consider apologizing and ask them to please fix your car this time. If you heard a noise and ignored it, a real mechanic would find it anyways. Just tell me so I can save us both some time and money. I'll help you through this if you respond. Take the largest man you know with you and when he starts yelling at you tell him to stop that.