Manager refusing to refund or issue a new electricity voucher

I bought R200 electricity on the 2nd of May 2015 at City of Tshwane: Silverton Motors Shell Petrol Station. I have tried entering the electricity token/voucher several times but it wont go through. The manager of the Silverton Motors told me to go to the municipality offices and inquire about it, i went there but to my surprise their system doesn't reflect that i bought R200 electricity. The manager even told me that he only distributes the electricity from BLUE LABEL DISTRIBUTION and he said its not his responsibility if the electricity voucher doesn't work. I have the receipt with me and i left him with a copy to investigate, but he doesn't seem to care and even told me that i wont get a refund or another voucher. I have tried so many times to resolve this problem, all im asking for is a new electricity voucher or a refund. If a person/company provides services to customers, the person/company should be responsible for the outcomes and try to resolve them. <br>