How to "help" sys. ISP admins find packet loss?

Question

Computer networks

I can not get the provider to find a problem on the line. Somewhere packets are lost and session falls. Sis. the provider's admins shrug their shoulders and say that there is no problem on their part and shift everything to the masters, who, in turn, changed the SFP modules on the switches and my media converter.
For my part, I increased lcp and the interval, but there is no point in this, except that the session has ceased to break, but at the same time I still sit without access until the router sends new packets so that the session rises (set LCP 5 packets of 60 seconds interval). What does this feature have to do with it, I can sit and wait until the session returns and then when it happens, it will return right after a minute, and sometimes all 5 packets are "waste", only sending PADT and raising a new session saves. This point, by the way, is also interesting to me, why is this happening, why are all 5 packages "lost"?
I am sure of the twisted pair cable, I bought it recently and laid it in the cable channel under the baseboard. And besides, if it was the case, would the link on the WAN port fall in the logs?
So here's how to get the provider's admins to find the problem, don't they have the opportunity to track the problem on their equipment, well, 100% percent of the aggregation is a hit.
Somewhere, either the switch does the brains, or somehow it is configured incorrectly, maybe the SFP or attenuation on the optics.
Because, as I understood from the last visit of the masters, they are not going to solve the problem.

Answer 1

Of course, there is no way to force these guys to fix the Internet. All you can do is change providers or demand a discount. According to the law, as far as I remember, they must send a commission to you and take a number of measurements. But in reality, they will send you away to the store for a new router or wires.
ps
The situation is exactly the same as with the lack of speed. It's just not customary to sue for your rights in the CIS.

Answer 2

The mtr utility (for windows winmtr) will show in the interface a map of packet loss statistics for each node on the network (first your machine, then your router, then the provider's gateway and further), it automatically uses requests with different ttl.
in practice, if one of the intermediate devices fails, then losses will begin to appear not only on this device, but also on all subsequent ones, but it can also be beautiful - one particular device will show losses - and consider it guilty.
if a firewall is installed on the device and icmp is disabled, then there will be 100% losses on it, by itself this does not mean that the device is to blame for network problems, you just can’t get information about it