"wert at service" is an archaic phrase meaning "were at the service of". Its antonyms would be phrases that suggest a lack of willingness to serve, such as "ignore," "disregard," "neglect," or "refuse". Alternatively, antonyms could include phrases that suggest a lack of availability or presence, such as "absent," "unavailable," or "not present". In modern times, the phrase "at your service" is more commonly used, and antonyms would include phrases such as "uncooperative," "unhelpful," "uncaring," or "uninterested". It's important to note that being at someone's service or offering assistance is a sign of respect and kindness towards others, and thus, the antonyms should be avoided in professional and personal relationships.