If any sheriff, upon the demand of any plaintiff or his attorney, shall wilfully refuse to pay over any sum of money collected for such plaintiff within twenty-four hours, the sheriff so in default, besides being liable to rule and attachment, shall be liable also to pay to such plaintiff or his legal representative the sum withheld and interest thereon for the time he may withhold such sum after demand at the rate of five per cent per month. And if any regular deputy sheriff (in the absence of such sheriff), having such fund, shall refuse one day after demand to pay it over, the sheriff shall, for such default, be liable to the same penalties as are herein provided. But nothing herein contained shall apply to the detention of money on account of bona fide conflicting claims.