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I am sorry to hear about this situation. Actually, a process server may attempt to serve the Defendant at work. This is not unusual. However, there is a fine line between sending a process server in an attempt to serve someone (the office can simply turn them away and they would be out of luck), and personally calling the office to complain/harass.
The office/company can file a restraining order if they feel that the harassment warrants it. This is up to the company to decide.
Personally, someone in your situation can file a lawsuit against the Plaintiff for tortious interference with business, which can at times include employment. This is an option if their calls lead to termination/negative action by the company against you.
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