Are these swiches managable via the gui
Manageable via GUI and CLI.
ARP cache is disabled on the switches
Seriously the MS tech's not joking, right? Or was he trying to get rid of you. Disable ARP cache? Might as well tell you to dump your switches in favour of a hub! It took MS support 6 days to track down the two hosts with duplicate IP address? With Cisco CLI it'll take any novice about 3 minutes (or less) with your setup of just 2 switches. Mate, I strongly believed MS tried to "con" you.