wrong phone number calls

For the past two evenings i have had numerous phone calls for a completely different number.

When asked which number they were trying to reach the reply was 020 8850 6941, these were from this persons family members, daughter, brother etc.

Our phone number is 020 8859 8081, as you can see even if they had dialed 859 instead of 850, the last four numbers are not even close.

I feel sorry for these people, they got through to us once, appologised tried again and again and still never reached the person they wanted.

What is happening here, not only is this costing the caller money, her brother is elderly by the sound of his voice, and he was getting distressed, but this is also anoying for us.

Can you please investigate this and sort it out

thankyou

L Sewell