I see that you don't want more replies, but I am not going to be mean (at least not intentionally), so I hope you'll read what I have to say.
First of all, if you see my recent question, my son is the one spilling the beans to his friends this year about Santa not being real. I DID have a huge talk with him before he said anything to his friends about how important it was NOT to say anything. I explained how important it was to his friends and their parents that they believe and that it was NOT his place to tell the truth or steal their fun. I warned him there would be a major consequence (no screens for a month) if he said anything. Unfortunately, he not only told his best friend, but KEPT talking about it even as the boy's mom tried to steer the conversation in another direction. I wasn't there so I couldn't do anything in the moment. Once my friend told me, I had ANOTHER big talk with my son and punished him as promised (slightly less than the original, as I realized it wasn't quite realistic, but basically no screens other than occasional TV through the end of December... started over a week ago so about three weeks total). The boys are six and in first grade.
Anyway, my friend WAS able to still convince her son that Santa is real. He asked if it was true that she was Santa and she said "Do I look like Santa to you?" So when he said no, she said "Of course I'm not Santa." That seemed to be enough. Other parents on the thread I posted have said things like "If you believe Santa is real, then he is real. If you believe in him, he will come."
Also, I don't think it's right to say "If you don't believe, you don't receive" unless your son is used to ONLY getting gifts from Santa. Most families I know give one large gift from Santa and then additional gift(s) from the parents. So, even if your son doesn't believe in Santa and doesn't get a gift specifically from Santa, won't he still get gifts from you? So he will still get a wonderful Christmas and the exact same gifts he would have gotten anyway, just one more tag will say that it's from Mom instead of saying from Santa. Right?
Finally, I know how hard it is that someone spoiled this for you and your son. Trust me - I feel AWFUL that my son is the one on the telling end. I get it. But, I do think that many children are starting to figure it out by age 8 and I don't think it's as big of a deal at 8 as it is at 6. While I will still talk to my son about keeping quiet and not spoiling it for his friends over the next few years, by the time they are 8 and in third grade, I don't think I would punish him as severely at all, since I think that's a pretty reasonable age to realize that the whole thing - as magical as it is - is just that - magic and pretend.
I hope, for your sake, that you can keep the magic going for a couple more years.