In that case, I doubt that you can get any new information from the call center. Furthermore, if your medicals were valid until July 2020, that means there are three possibilities:
1- Your medical exam expired in July 2020 and they didn't extend it.
2- Your medical exam expired in July 2020 and they extended it for 6 months, then it expired again.
3- Your medical exam expired in July 2020 and they extended it for 12 months (can be done only for certain countries), then it expired again.
So especially after considering the fact that IRCC can not give extention to a medical exam more than once, you are gonna need to get another exam after September 7, and you're in group C like most of us in IRCC's new list. (Check my previous post to see what is group C:
https://www.canadavisa.com/canada-i...ard/threads/fsw-worldwide.739338/post-9604880 )