Bt engineer charge

So a few months ago i upgraded my BT internet to infinity, they had a deal same price as i was paying for alot more speed, bargain! Check, yes you can get infinity at your property. Paid for a new hub, had my orginal broadband for a few days, day of upgrade arrived, sat online (not even sure it had upgraded) and suddenly no internet! Phoned BT, there is someone at the exchange so give it a few hours, which i did, no joy, phoned bt again, did all the checks, master socket ect, you need an engineer, is that going to cost me? No. Okay, when? A few days. And its not going to cost me? No it isnt, okay np scheduled for a few days later, meanwhile no internet. So phonecall from said engineer a few days later, he'll be with me soon, great! Comes in does his checks with his giant phone, leaves goes to the box up the road, rings and asks if its working, yes it is, horray. So he comes back and explains that the previous person who unplugged my original broadband hadnt plugged it back in again, or something like that. He then said oh you have an old box in the house i'll change it, i had one socket and a filter, and he changed it to a double socket, again no mention of a fee. So get an email from BT today, your bill is ready to view, which i dont always bother looking as i dont make many calls and if i do i wait for cheap rate, but i checked today, to find i am going to be billed for a £129 engineer call out fee for broadband improvements :mad::mad: Obviously ive already been on the phone having a rant, they are 'Looking into it' well they better keep 'Looking into it' until i have it taken off my bill! Their engineer complaints department are going to have a look, and will let me know the outcome in a few days, talk about giving the choice to the accused!! I can see that im not the only person who has had these charges added unjustly! If BT think im rolling over and accepting this, they have picked on the wrong !!!!!!