If the problem isn't with your router's PPPoE configuration, then work with your company's VPN support staff to...
monitor traffic from your VPN client to isolate the problem. For example, incoming IKE but not IPsec can be an indication that your provider blocks protocol (not port) 50. Incoming-but-errored IPsec packets can indicate a fragmentation or NAT problem. Returned IPsec packets that never reach your VPN client can indicate a NAT-ing device that does not supporting VPN pass-through. Comparing traffic logs at both ends (VPN server and VPN client) and traffic counters on your router can help you spot the device or "hop" where packet drops occur.
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