Deregistering imessage not working

Hi all,

I am having a lot of difficulty transferring my phone number to my new Android phone.

I fully completed the deregistration form by Apple, and my phone number is no longer connected to imessage.

However, I still cannot receive messages from all my contacts who were Apple users. Their phones when using imessage send messages that are received on my laptop.

I am pretty sure that they are sending imessages to my apple ID which automatically send messages to my icloud email rather than my phone number.

e.g. When a contact tries to call me through Facetime it is not available, but when they message me it is still comes up blue ('imessages') and delivers without me recieving a text on my phone. Instead, it goes to my laptop.

How do I ensure that my family and friends who have Apple phones do not send messages to my Apple ID but instead to my actual phone number?

I really don't want to have to manually delete my contact on all my friends phones, and there are people who I have in contacts that would have my apple ID but I have no other way of contacting.

Open to any advice and thanks in advance!