The complaint in a small claim action shall be in writing, signed by the party or his attorney, except the complaint in an action for summary ejectment may be signed by an agent for the plaintiff. It need be in no particular form, but is sufficient if in a form which enables a person of common understanding to know what is meant. In any event, the forms prescribed in this Article are sufficient under this requirement, and are intended to indicate the simplicity and brevity of statement contemplated. Demurrers and motions to challenge the legal and formal sufficiency of a complaint in an assigned small claim action shall not be used. But at any time after its filing, the clerk, the chief district judge, or the magistrate to whom such an action is assigned may, on oral or written ex parte motion of the defendant, or on his own motion, order the plaintiff to perfect the statement of his claim before proceeding to its determination, and shall grant extensions of time to plead and continuances of trial pending any perfecting of statement ordered. (1965, c. 310, s. 1; 1971, c. 377, s. 10.)