Refusal to refund me on Telkom Cellphone Vouchers

I went into the Riverside Centre store to buy some Telkom 8Ta Cell phone vouchers this afternoon, to the value of R500. Unbeknown to me I was sold Telkom Landline vouchers which I was unable to use with my cell phone. Having called Telkom, who tried to assist on the phone, I then went into their office only to be told that I needed to organise a swop or refund with Pick'n Pay. The store manager was not only unhelpful, patronising and extremely rude, she also refused to organise a swop in the grounds that I should have been more specific. All she could say was that I needed to go back to Telkom, who have already passed the responsibility back to P & P. Having being a loyal shopper at P & P for many years, with my Smart Shopper card, I no longer feel I can shop there anymore. I am R500 out of pocket, with no phone time, as I cannot afford any at this stage. This is disgusting service!