In description has doorbell function, but real do not!

I bought it because I need a doorbell. And my entire system on the Tuya platform. I don't really need the security system, but since it can be an additional accessory. The description says that this security system has a doorbell function. That's why I chose her. Unfortunately, when it arrived, I couldn't detect the doorbell. After contacting the seller and asking for help, he promised to send me instructions by email. Unfortunately, I received the following reply by e-mail:
"Dear customer, good day. Regarding your order: 3038386015225202
We sincerely apologize for your shopping experience this time. We are unable to find related user manuals. If you are not satisfied or do not know how to operate the goods, please use this link to request "Return/Refund" accordingly:www.aliexpress...
Thank you for your understanding and hope you have a lovely day."
So I don't need this product because it doesn't match the description. I can return it if aliexpress or the seller pays the shipping costs to China about 35 EUR.