"Does the court have jurisdiction in this matter?" -- Yes. Jurisdiction is different from venue. In any event venue may be proper in both counties particularly in a commercial transaction.
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I agree with my colleague. The Ventura County Superior Court likely can assert personal jurisdiction over your business located in Kern County. The venue may also be proper in Ventura County based on an argument that payments were due there. However, if you feel the venue is improper, you may timely bring motion for transfer of venue. Keep in mind that if you improperly seek transfer of venue, you may end up owing attorney's fees or costs to the Plaintiff. Take a look at California Code of Civil Procedure section 396b (see link below). Be sure to consult your own attorney to protect your legal rights.