Connectivity issue over Ethernet Dedicated Line:

Thank you in advance for any assistance,

We have been having trouble with our line, it went down for an unknown reason (both directions) over a week ago. To my knowledge nothing has changed, especially as far as the LAN. On each side of the line there are DCP3008 Cisco modems, configured as bridges so they don't actively do anything besides transfer a cable signal to ethernet. Ethernet line from modem is plugged into ETH1 in an ER-X router. A static route is defined on the ER-X to hit the connection which is designated 10.1.0.1 from one side from 10.1.10.1(Local ER-X), next hop to 10.1.0.2 is the connection to the ER-X on the opposite end of the line, then to destination 10.1.20.1/24 which is the ER-X on the far side. Now I can hit all these IP's locally from their respective locations, but try to ping one over the connection and I might get device unreachable if I'm lucky. 

I have had a technician out twice in the last week, everyone assures me that this is a problem on our end, which is very possible, I'm no expert, but it seems to be a fairly simple setup and I'm not sure where we are going wrong here. Last time the guy was out he mentioned VLAN tagging...but all traffic should be by default VLAN tagged as default 1 which should be available to travel to and from all ports on the network. We haven't segregated anything or implented other VLANs. So I'm having trouble wrapping my head around why VLANS have anything to do with this connectivity issue, and especially how I would implement them to remedy our situation. 

Please let me know if I'm misunderstanding anything at all, I've literally learned the majority of what I know about network administration in the last week! I will provide pictures of the ER-X routing page tomorrow at work and perhaps someone can point me in the right direction. 

Many thanks.

J