Unauthorized adjustment to contract

As the title states. We signed up for 500 upload and download speed with the match add on.

Our speed was then doubled to 1000 download with volt, however someone has gone and edited our contract to exclude the speed match, now capping us at 100 mbps. This is fraud right? I have both contracts in front of me, with every single rep telling me it’s fine.

Next step is the ombudsman unless anyone has advice?