(a) Notwithstanding Section 53.111(a), if the commission does not make a final determination concerning an incumbent local exchange company's rate change before expiration of the 150-day suspension period, the rates finally approved by the commission take effect on and the incumbent local exchange company is entitled to collect those rates from the date the 150-day suspension period expired.
(b) A surcharge or other charge necessary to effectuate this section may not be recovered over a period of less than 90 days from the date of the commission's final order.