payment not reflecting in my account

On 22 July 2015, i payed Woolworths account through internet banking. Up to now it has not reflected though the banking details are correct and are supp**** by the company. I keep receiving calls from Woolworths saying i have not paid,and requesting a proof of payment. I have sent proof of payment numerous times to an email address given by them . Even now i keep receiving calls from this retail for a payment i made and sent proof of. It is soo annoying and discouraging because i used internet banking with the hope of paying in time and avoiding a bad credit record but now my efforts have varnished. Sooo disappointed