I need some advice about my situation and I hope someone will be very kind to help me.

I was doing an Internship at a company and my visa was going to expire on March 23th. However, I didn't enjoy the internship as they were making me work extra hours, their company culture was horrible and they were treating me very bad so I was quite depressed.
I resigned the internship and my sponsor BUNAC terminated the sponsorship with good standing on December 10th, I had some personal problems to leave the country immediatly that's why I was supossed to leave on January 7th, they told me it wouldn't be a problem as they're usually very busy (also because it was December) and this may not happen within 30 days after terminating the sponsorship, so they advised me to wait until the curtailment email has arrived.
I never received any email from the Uk Gov neither a letter to my home address, I checked every single day also in spam but I'm just worried I might overstayed as I don't know if I received an email or letter? I've seen that there are some people that never receive any notification and they're visa has already been curtailed. I just want to be sure about the wrap up period.
I have read that the leave is curtailed to 60 days. But recently I came across this document: https://assets.publishing.service.gov.u ... tv16.0.pdf
And it says "If you curtail a Tier 2 or 5 migrant’s leave because the employment, volunteering, training or job shadowing will end earlier than originally expected, you must curtail their leave to the new end date plus any wrap-up period that was originally allowed."
I'm not sure which wrap up period I was supossed to be given? I'm very nervous as I always been super careful with these things, I don't want to have a future problem and a bad Immigration history, BUNAC has told me there is nothing to be worried about If I didn't receive any email.
I have so much anxiety, I really hope someone can take the time to give an advice. I've tried to call UK HOME OFFICE but the number just sends me to several voicemails.
Thank you so much for taking the time to read.
Ximena