Can I sue my mortgage company for this?

We've been making all payments, but we got a notice in the mail of "intent to foreclose" because they say they did not receive payment in May. We've printed off a copy of the check from our bank statement and have proof that it was cashed. It's Guild Mortgage company in California, we are going to call them Monday about it and see whats going on, but I was wondering if it is possible to sue them for this. It's really upset my mom to the point of crying and I am infuriated about it.