A receipt is a written and signed acknowledgment that money or goods have been delivered.[16] Although a receipt is not conclusive evidence, an exhaustive review of the records of this case fails to disclose any other evidence sufficient and strong enough to overturn the acknowledgment embodied in respondent’s receipt as to the amount it actually received from petitioner. Having failed to adduce sufficient rebuttal evidence, petitioner is bound by the contents of the receipt issued by respondent. The subject receipt remains as the primary or best evidence.[17]
http://sc.judiciary.gov.ph/jurisprudence/2011/february2011/179242.htm
Batas Pinoy 