Poor service from PG Glass

After contacting PG Glass on 5 October 2021, I am still waiting for them to come to my house to install a mirror and a small window. They were keen on my payment, but after numerous Whatsapps and e-mails to them, I finally get an e-mail stating that they will make an appointment as soon as they have glass on (sic) stock. Today is 28 October 2021 ( 23 days later). This is how long it takes to get any reaction from them...not to have it installed. If I cancel the installation, will I ever get my money back? And how long will that take?