Forced to provide my email ADress go receive till slip

I paid for a clock at 11:38:48 18 Feb 2023. The staff member was convincing me to receive the till slip via email I insisted that I don't like to receive till slips from stores since I always have to block them because they also send adverti*****ts which are very annoying. She said the emailed slip will protect me when I have to return the item. She was busy trying to convince me and I was annoyed and getting angry because when I say I dont want want something, it means I don't want it. I wonder what happens if the customer doesn't have an email ADress. Is it now compulsory for us to receive slips via email ADress. Is there a new policy stating that we need to submit our emails at stores to receive the slips. I was annoyed and gave her my email ADress because I could see from her facial expression that she really wants me to type my email ADress and that's the only option available. She printed only the slip showing that the transaction went through. Then I decided to read the back of the slip. It's read "should you not have the slip, we will be happy to exchange". But then, why are we forced to give our email addresses if it is not appearing anywhere. The lady told me that if they send adverti*****ts, I must block them. I dont have time to be cleaning trash from my emails. If now, we must have email addresses to receive till slips, please tell us before buying.