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Proper service in Texas requires that you be personally served a copy of the suit and summons by process server, either placed in your hands or served to a person of appropriate age at your residence (domiciliary service). If they cannot prove you received service and they obtained a default judgment against you, then this is grounds for you to vacate the judgment.
As far as account garnishment, they had to get a judgment against you first and you have 30 days from being served with a suit to answer. If they just filed the suit on 3/11/13, it is not likely they have obtained a judgment yet, but presuming they have it is still very fresh and there is time to vacate the judgment.
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