Pneu 26 pouces

iI have a kommoda fat tire. need to replace both outter tire plus inner tube
SIZE 20 X.04. I have never had so much problem just trying to order this size. Firstly I DO not NEED A 26INCH . trying to explain this is just like talking to a wall . i get return emails from different persons.Catylin. kaia. Alex, Jean Baptise. The bike repair shop tried phoning to explain of course he only go a answering machanice. Bloodly awful service. Also if i have this size of tire 20x4.0 WHY is this not on your web site to buy.