(a) If the tax first levied shall prove insufficient to pay the bonds, both the principal and interest issued by the board of commissioners on account of an improvement, as provided in this subchapter, as it shall become due and payable, they shall, from time to time, make such further levies upon the property previously assessed for sums sufficient to complete the improvement and to pay such bonds and interest, which shall be extended and collected in the same manner as the first levy. However, the total levy shall in no case exceed the value of the benefits assessed on the property with interest.
(b) The performance of such duties may be enforced by mandamus at the instance of any person or board interested.