Online shopping

Tried buying a Gentech 3kva inverter generator online. Leroy Merlin gladly took my money and sent no email to confirm the password for my new account. Received a call the following day that sorry we do t have that generator in stock, nor have we had for at least 2 months. The generator is still showing as avaialble if you look on line. So due to the companies incompetence I must wait 7-10 days for my money due to the companies neglect. Why can the company not issue an immediate payment due to their errors? The contact i had at the call centre is also not responding to my emails. If the company is unable to fix their IT issues perhaps they should train their staff on how to deal with customers. I want written proof that my funds have been refunded, i cannot trust that they will refund when they say.