Many of us have gotten UNWANTED and UNSOLICITED text that never end, text after text of hateful, unprofessional conduct and vile, viciously aimed content. This phone STALKING is being taken seriously.
People violating these laws may receive fines, prison sentences or both.
If someone harasses you, make sure to KEEP the messages.
Your smart phone has setting to automatically delete messages after a certain number are reached. Turn the setting OFF.
For your specific case, consult a lawyer.
Of course you can also just block the caller.....