Seriously not happy! STILL Waiting for BT Engineer to turn up when he's meant to

[#1]

This is getting really tiring now. To bring you up to speed:
13th July - Raised a fault as my fibre optic speed was down from 22-25mb to 2-3mb. Again. Faults team go to work.
31st July - Told that a BT enginner would need to come around to resolve the fault. I book in 5th August PM.
5th August - Waited in all afternoon and nobody turns up!
6th August - BT engineer decides to ring my bell at 8.20am as I'm in the shower getting ready for work. Greeted with a 'sorry me missed you' card. Left a message on this forum and received a phonecall from PN soon after to apologise and to rebook the appointment, which was made for 19th August.
14th August - Something comes up which means I wouldn't be in for the 19th August, so I immediately phone PN and tell them this. I change the date and I'm told the 19th August booking has been cancelled and re-arranged to the 26th.
19th August - BT engineer arrives just as I'm leaving to catch a train. I tell him that the appointment had been cancelled and rearranged for the 26th but he said he hadn't been told and that he had had to drive a long way to get to me. Left another message here, apologies and promises of investigations were given.
And so, now we come to the 26th. I wake up at 6.30am on my day off from work so I can be ready for 8am for the AM slot. At 8.30am I receive a phonecall from PN telling me that, guess what, the BT engineer visit has now been cancelled! Apparently it's now a network fault which is causing all my problems, and so the BT engineer didn't need to come after all!
Seriously!? Just... seriously!? I'm paying £20 a month (I signed up, sadly, just before the 6-month special offer of £12.50 (which still seems to be going on) for a pitiful speed I've had for coming up for 2 months and the BT engineers only now realise they didn't need to come over after all!? This is getting stupid!

[#2]

It's making me ill seeing the 38mb speed package currently advertised at £3.75 a month...

[#3]

Hi MykeUK,
I'm very sorry to hear of the issues you've experienced recently with regards to your connection. I've had a look into your account and can see that the fault is currently with our Phone Faults team as they've identified a fault on your phone line which may in turn be impacting your FTTC service. This is detailed on Ticket: 88493541 and the estimated response time provided by BT Openreach is 28/08/2014 23:59:59. Our Faults team will check back after this time and provide any further updates on the ticket.
Apologies for the inconvenience caused by the previous engineer's visits.

[#4]

I'm not sure why it's taken them over a month and a half to realise this, especially after 3 failed attempts at getting a BT engineer to me before now in the first place.