We were advised that our vendor is having issues regarding all Wholesalers.
Their servers are giving a incorrect DNS Server instead of ours, to any, but not all Wholesale Customers. There is a master ticket open with them to rectify the issue hopefully shortly.
The quick fix is I simply put our DNS Servers (Primary: 126.96.36.199, Secondary : 188.8.131.52) into your modem/router for now.
Can you give that a try and see if that fixes your connection?
Edits: I can't spell tonight
E-Services Team Leader
Authorized TSI employee - Teksavvy Solutions Inc.