Bandwidth Testing – How to Test Dedicated 10 Mbps Bandwidth

Level 3 has recently installed a dedicated internet conection (10 Mbps 1:1) in my company.

When I use speedtest.net or any other test website, speed values are vey poor (1.56 for download, and 2.39 for upload).

So, I claimed Level 3 for not providing the agreed bandwidth, but they said they performed a "saturation test" in which bandwidth reaches 10 Mbps. They also said their test is accurate because it doesn't depend on a test server like speedtest.net

How can I know they are telling the truth?.

This is the image:

This is their report:

FastEthernet4 is up, line protocol is up
  Hardware is PQII_PRO_UEC, address is b838.61ac.b57c (bia b838.61ac.b57c)
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
     reliability 255/255, txload 25/255, rxload 25/255
  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:42:18
  Input queue: 4/75/0/0 (size/max/drops/flushes); Total output drops: 335
  Queueing strategy: Class-based queueing
  Output queue: 64/1000/0 (size/max total/drops)
  30 second input rate 10060000 bits/sec, 832 packets/sec
  30 second output rate 10038000 bits/sec, 829 packets/sec
     1085479 packets input, 1634002628 bytes
     Received 220 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     1083785 packets output, 1632163458 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out