Same problem yet again max speed and ip profile sl...

Question

I have only just had the issue fixed and it is again here it seems to happen between the 3rd and 5th of each month. 
Everything was going good 28th august did speed test my max achievable speed was 7150kbps. My ip profile was 2500kbps.  My hub setting for noise was at 3.0db/19.0dB
1st September noticed the speed was not as quick did a speed test max achievable speed was now 2000kbps and my ip profile had gone to 2000kbps and my hub noise was on 12.6dB/18.0db
This morning i got a phone call but nobody there checked my speed after as ive had such calls before and after these have happened it affects my broadband WELL GUESS WHAT 
my Max achievable speed is now 500kbps and my ip profile is 500kbps and my hub setting shows my noise at 19.1dB/ 16.0dB So again i cant really use my broadband as it takes so long page to load it times out.
this is happening every month now from march and im getting really fed up with it now it gets fixed yep for a short while but then im back to square one again the beginning of the next month . I would like this issue to be fixed for good.

Answer 1

I have done the quiet line test and i hear nothing the modem is connected straight into my main socket which is the only phone socket i have it does have a built in filter in it.
here are todays hub settings that ive just done 
ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
0 days, 15:33:46
Downstream:
800 Kbps
Upstream:
448 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
18.8 dB / 16.0 dB
Line attenuation (Down/Up):
57.1 dB / 31.5 dB
Output power (Down/Up):
16.5 dBm / 11.9 dBm
FEC Events (Down/Up):
55099 / 76
CRC Events (Down/Up):
6444 / 76
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
11230 / 16
Error Seconds (Local/Remote):
514 / 79
here are the speed test results ive just carried out at the time of 20.19pm
Test1 comprises of Best Effort Test:  -provides background information.
Download  Speed
448 Kbps
0 Kbps
500 Kbps
Max Achievable Speed
 Download speedachieved during the test was - 448 Kbps
 For your connection, the acceptable range of speeds is 50-500 Kbps.
 Additional Information:
 Your DSL Connection Rate :800 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
 IP Profile for your line is - 500 Kbps
If you wish to discuss these results please contact your ISP.
If you are experiencing problems with specific applications, servers or websites please contact your ISP for assistance.
Your test has completed please close this window to exit the performance tester.