being charged taxes

Hi I noticed on the past 3 months of my bills I been charged HST taxes. I am tax exempted and have been having taxes taken off bill but these past 3 months show taxes. I tried to email the tax exemption I have and I have herd nothing back. I’m wondering if SEPT OCT NOV 2026 can be looked at. All my lines are being charged taxes. I tried to do a bill review but keep getting please try again and haven’t been working at all. If someone can look into this that be great thank you.