Price of cavity wall insulation

[foxyferret]

I signed an invoice and agreed a price with a large nationwide company. I have my copy of the invoice. After the insulation being carried out today, I was told it would be £50 more. The installer had his copy, same as my copy BUT someone had crossed out the original price and written a new price over it. Surely, once you have signed to pay a certain price, it cannot be changed without your consent or your new signature. I refused to pay the new price as it was not the price agreed. I have been told I will get a letter from Head Office so I have to wait and see what it says. I cannot believe this is correct, what do other abers think please?

[bednobs]

you usually aren't invoiced till after the work is done, so perhaps you ahve a copy of the estimate?

[bednobs]

did they say what the extra 50 was for?

[buildersmate]

It isn't an estimate, bednobs, its a quote - there's a very important difference.
The answer to the OP's question is that the original price stands.

[sammmo]

I wouldnt pay the extra £50.. just tell them your paying the original price agreed and if they want any more they should take you to court..

[foxyferret]

thanks for your help. there was no estimate at all. guy came to the house, did the survery, then said I will do it for X amount. paperwork done the same day, cost agreed and job sheet/invoice signed by me. I have no intention of paying this money, how dare someone change the amount after I had signed it. I was hopping mad to be honest more like a bunny than a fox! The work was done with the aid of a government grant, I was told it had gone up since I signed up, so maybe they were not getting such a big sub from the government. Not my problem I don't think. Thanks to all who replied anyway, I have now calmed down and off for a glass of vino.