La. Stat. tit. 33 § 4507
The orders of the municipality fixing or establishing any rate, fare or charge, for services rendered or to be rendered by any utility operating trackless trolleys or motor busses under franchises granted by the municipality, shall go into effect at such time as may be fixed by the municipality and shall remain in effect and be complied with, unless and until set aside by the municipality, or by a final judgment of a court of competent jurisdiction, in a suit to set aside and annul the same; provided however, that if an interlocutory injunction is applied for, and if of the opinion that irreparable loss or damage would result to plaintiff unless a temporary restraining order is granted, the judge of the district court having jurisdiction may grant a temporary restraining order, to remain in force only until the hearing and determination of the application for an interlocutory injunction; provided, that no injunction shall issue until after five days notice has been given the municipality.
La. R.S. § 33:4507