Need someone to do demand letters & Foreclosures in TX

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I do Owner Finance in Texas. Most of my deals are in or near San Antonio. From time to time a buyer does not want to pay as agreed. I had one attorney that sent out demand letters and did one foreclosure on our behalf. The problem is the attorney charges a bit much in my opinion just to send out the demand letter. This makes it even more difficult for the buyers to come current. I Understand that as the lender I can send out the demand letter, but coming from a third party seems more serious to the buyers IMO. Also the attorney has not responded in a timely manner a few times. One time he forgot a week plus so we missed an important deadline

Does someone have any recommendations for this matter?