A let down

I've been with vox so long now , never had issues but a week ago the had to do maintenance which lasted a week and in the entire time i had no Internet it lasted way past the end date of the maintenance window which ticked me off and now it's finally back on to only have horrible slow Internet speeds. Vox claims its my router which is funny it was working perfectly fine before the maintenance nonsense started. Im having constant buffering and also more people are having the very same issues so how can it be just my router? They don't want to own up with the fact somewhere they messed up and are not coming up with a fix im truly disappointed in vox on how much they have messed things up for their customers