not expert on this, but don't think it's a big problem (and it is very possible) that you don't hear back from IRCC in 30 days. You can use the letter as long as IME #, UCI etc are provided and correct. doctors use emedical and don't care about address and contacts. my family has canadian address on the form and did medical in home country. no questions asked.
meanwhile keep reaching out to IRCC to fix it. Wrong address will be a problem when the time comes for passport request.