Its not what was ordered, just cos its been spread out doesn't mean its acceptable. I ordered some top soil once and it was delivered and I barrowed round to the back garden and filled my rockery area, decided after I had done that it wasn't topsoil as such as had bits of glass in it etc, after having conversation with trading standards people barrowed it all back to the front and got supplier to collect and deliver proper topsoil which he fortunately did with no hassle. Talk to your trading standards people and possibly bluff the supplier that you are going to take him to small claims court to recover your costs for its collection/removal . You decided on the need for MOT 1 for your project so I can understand why you don't know want to have an inferior build and use the carp you have been given. Of course I was much younger back in the day and was up for a fight these days I may well not want the hassle and in your case time looks an issue.