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The FMLA law doesn't disallow the employer from contacting you about your return and confirming it. Text messaging you several times, while it may have been harassing to you, really isn't going to rise to the level of harassment necessary to suggest FMLA retaliation.
The employer here can at least claim a legitimate purpose (making sure hours are covered and knowing when to start your computer access again).
Furthermore, even if it did rise to the level of harassment, it's too late now to make any sort of legal allegation. You would have had to do so within 300 days of the offense and if this occurred in January of 2015, it's too late now to raise the legal issue.
But again, while I can understand this as being annoying, a few texts during that two weeks doesn't rise to the level of harassment. You'd need to a few texts a day, emails, phone calls, etc. (trying to get you to do work or pressuring you to return before your FMLA date) to be able to make a harassment allegation.
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