Ridiculous slow (actually could not open web pages and 80% packet loss when ping) on Complete Fibre

Hi,



I have been ver patient up till now that I cannot even browser a single web page (google). 



I'm a software developer so I know how things slows internet down and how to ping and use network tools to diagnose before bothering you Talktalk engineers or customer services. But now I will take my steps till this issue is resolved:



1) I'm on Complete with Fibre business broadband at my house because I work from home.  The promised speed was up to 76Mbps - and the engineer who came to install my fibre broadband told me we live very close to the hub so the speed should be very good.  The testing result on that installation date was very close to 70Mbps so I was really happy.



2) I didn't notice too much speed issues since for the first few months (October, November), till late December.  Initially I thought it was because Christmas and the flood causing the internet probem, but now it's late January! I don't see anything improving and more importantly the speed gets almost like "deliberately" drawn down to a extremely low level everyday from around 4pm.



3) I have done couple of speed tests, and the highest speed I got over the past few days after 8pm was about 3Mbps download, and the worst speed I got was about 0.3Mbps!!?Can you believe it?    And the other thing to report is that the upload speed has been always above 7Mbps and seems not affected!



4) PING command. Now the testing of the connection using ping command - it's almost like there are some kind of disruption going on because the ping command returns 3-4 packets loss per 10 packets, and sometimes worse, causing complete interenet inaccessible.



5) I went crazy in the past few days and coincidentally found out that the internet speed went back to normal around 1-2am.  and download speed strikes up from 30Mbps to nearly 40Mbps at times. plus the upload speed doesn't seem to be affected, it really made me thinking have I been affected by residential bandwidth too much?? or have I been deliberately shutdown for evening uses of my broadband???



5) I understand that I signed for busness broadband and appreciate the bandwidth might be shifted for residential users however I don't think I signed for a contract that I will not use internet during evenings!



Can someone investigate please.  I don't use landline so I don't even connect a physical phone to the line, just broadband. I'm a software developer, internet is my business, and broadband speed is what keeps my blood flows...



Looking forward to geting some concret help from this community's Talktalk support team, and if not I'll ring up the customer service as next step (which has been not very helpful as I general experienced from BT in the past).



Someone, help!



[NOTE:  Currently I'm using my three mobile broadband to publish this forum thread, because I could not use my "Super SLOW Complete Fibre"!!]