Poor customer service

On the 26-08-21 I bought a lump for kids room by decofun modderfointein when I reach home the bulb for that lump was unusual, the next day I went to shops around greenstone mall to buy a bulb no luck, I went back to decofun explained my situation they told me they don't returns pumps, I told them there is no terms on your receipt to say that, I really like the lump, I've asked them to arrange the bulb for me then I can buy from them they refused, the manager jabulani said I will do a refund on your card but we gonna take a certain percentage on your money, I asked how much he told me R70 from the R169.99 paid i said that's a reep off I don't agree they said its a policy, the policy that is not on the receipt?? for me not to loose my money I forced to add n buy s wall deco that I did not need by the time. I won't shop from them in future I'm very disappointed and won't refer friends n family to them