Contact the title company immediately - in fact if possible, go directly there in person. See what happened and why the fees were not paid. All title companies ,I know of , require an estoppel letter from the Association
of break-down of fees including past due fees due at time of closing...before they will conduct a closing. Make sue the title companycalls the attorney's office while you are there. Get your agent involved in this.
This is very serious, so please, get right on it.