Really poor experience

Purchased an excersize bike online, followed the usual process and all seemed well, then next I am told via a message that there will be an installation done at my premises.

This was not mentioned anywhere on the website during the purchase, so I enquire, and kindly ask that I do not want this and have not asked for this.

Next I am told that if I do not accept their installation service I have no warranty on the device I already paid for and have not taken delivery of yet.

Trying to get to the bottom of this, customer service decides to question me as to why I do not want installation?

Have enquired with other vendors, and they all offer installation as an additional service, but none of them take away your warranty if you install a device yourself.

Now I have to wait 5 days for a refund, which customer service was too happy to comply with, instead of trying to retain a customer and not to loose a sale.