If the problem isn't with your router's PPPoE configuration, then work with your company's VPN support staff to...
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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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