Lovisa bad Quality and ***** money

This Jewellery Store are the Worst I bought a necklace for my girlfriend and after a few weeks the hole necklace got a different colour and then when we wanted to return it the said they will not take it back because it is after a month. and then on another order I bought belly rings I placed a order I in my cart the amout that showed was R648 and the when I made the payment the amount that went off was R840 and you must please refund me the difference. I even have a screenshot photo where the prices show and the time that I took too show my girlfriend if eveything was right just before checkout. So I please want my refund or I will keep leaving bad reviews until you do. Please get back to me ASAP