Jenelle Evans and her ex-fiance, Nathan Griffith, are at war on Twitter.

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After Griffith called out Evans for keeping his son from him several days ago, the Teen Mom 2 star reignited their feud with a tweet of her own, claiming Griffith is harassing her with non-stop phone calls from a blocked number.

In a since-deleted tweet, shared by Real Mr. Housewife on October 21, Evans told Griffith, "I’ve already spoken to your mom and we set something up so why do u keep harassing me?!”

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Evans and Griffith began dating in June 2013, following the reality star's split from former husband Courtland Rogers. One year later, the couple welcomed their first child together, son Kaiser. Although Evans and Griffith maintained a healthy relationship for a short time, they began feuding early this year, and called it quits in July amid rumors of abuse and infidelity.

Earlier this week, Evans was accused of keeping her son fron Griffith.

"There's a no contact order between me and her and Nathan has no license and no crib for him... Nothing," Evans replied, according to a separate Real Mr. Housewife report.

However, Griffith told a different story.

"Do have a crib, [clothes] and other people can drive him," Griffith wrote back to her. "You're jealous and butt hurt and date a thug but I can't see him... WHEN CAN I SEE MY CHILD!"

Tags: Jenelle Evans Teen Mom 2 Nathan Griffith Reality TV MTV