**** at Westgate ackermans because I dont have slip but system shows that I only used 1 voucher

Ackermans at Westgate is a ****, I called customer care using my personal phone because I couldn't be assisted within the store level, they still refuse to to assisted me yet their system does show that I only used 1 voucher, ashylin was helping me when I tell her I deleted the sms sent she still refused to assist me, can I get my voucher