The reasonableness, justice and validity of any rate, charge, rule, regulation or requirement on file with the Commission for any telephone company shall not be questioned in any suit brought by any person in the courts of this Commonwealth against any such telephone company, wherein is involved the charges of such company for the transmission of messages, or the efficiency of the public service and in all the courts of this Commonwealth they shall be conclusively presumed to be reasonable, just and valid. All such schedules, rules, regulations and requirements shall be received and held in all such suits as prima facie the schedules, rules, regulations and requirements of the Commission without further proof than the production of the schedules desired to be used as evidence, with a certificate of the clerk of the Commission that the same is a true copy of the schedule, rule, regulation or requirement on file with the Commission and so offered in evidence.