The place to start is with the exact model number of your phone.
It appears there is a significant problem of counterfeit Tecno phones, so it seems possible that could be an explanation for why you can't find a screen to fit. To verify you have a genuine Tecno phone, go to this web page and follow the instructions to obtain the IMEI and VC numbers.
[link|https://www.techcityng.com/verify-original-tecno/|How to Verify if Your Tecno Phone & Battery are Genuine - TechCity|new_window=true]
Once you have the model number and have confirmed you have a genuine phone, we should be able to help you locate the proper replacement screen.