Did anyone uses mad for it?

Do you know shop called Mad for It? It's online and I think it's a scam..I'm stressed out don't know what to do..I ve tried emailing,phoning,chat online there's noone available...I m so worried,I wanted to buy nintendo swicth for my daughter for her birthday and it's was supposed to br £22 a month which I m ok with it it has changed to £62 every two weeks!! I cabt afford it!!!