PNP express on the N2 before Sir Lowry's pass

I stopped to get water and sweets from PNP express on the N2 in Strand and the payment went off twice. Th cashier told me the machine give issues due to loadhsedding and made me tap my card again and now the funds was deducted twice. i never knew that a company like pnp would train their staff to do ****s like taking double payment. This is extremely disappointing.