Pro shop - not so pro on service

Early September (more than 3 months ago) I bought a Pro Shop Voucher with the intention that my nephew can use it to buy a new club for his birthday. The very same day he tried to buy the club on their online sale and it didn't work. I promptly reported this to them and asked how we could obtain the club that was on special. Nanette Arentsen sent me an email saying that they are sorry about the issue and that she can organise the club as long as I send her the voucher codes. The club came on special again since I tried to buy it online and since September Nanette nor anyone else at the Pro Shop came back to me. Now that I am bombarding them with emails Nanette says that she cannot redeem those vouchers for me online. Seriously, if they didn't ignore me for 3 months then I would have been able to buy the club in store if it doesn't work online. Now I sit with a voucher that I have no use for and they have stopped responding again...