Doubts about the company's competence

Hello and good evening,

I have the following concern. In my house from the 70s, my rainwater pipes (approx. 12m easily accessible and 16m somewhat more difficult to dig) need to be renewed. For this, I have commissioned a small, local company. The offer seemed okay to me. My offer estimated about 20 hours. Now, naively, I thought a narrow trench would be dug and a new pipe laid. Meanwhile, 3 days have passed and I have a 2-meter-wide trench and an equally wide pile of dirt in my garden. But the shorter pipe has not even been laid yet. (To be fair, I have to say that a concrete slab delayed the work by half a day). That is one thing, but the bigger doubts arise from the following: 1. I have been asked several times how he wants to do the pipe??? 2. He has dug a trench much too deep, closed it again with loose soil, and laid the new pipe on it without compacting. He said compaction is not possible there??? 3. He connected the rain pipe to the gutter and then led the open end into a pit at the foundation, where a masonry sealing was just being done and an as yet unsealed core drilling was present. When I noticed it, the water was only a finger below the drilling, the fresh sealing was already underneath.

Now finally my question, what should one do in such a case?

Having it repaired when, in my opinion, he does not really know what he is doing does not seem sensible to me. And how to prove defects when everything is underground. Even if it is poorly done, it will still hold for a few years. Stop and commission another company? What do I have to pay then? I am really at a loss here.

Thank you in advance for your tips and advice.

Best regards, Jan

pictures say more than 1000 words.

Hello,
my question was not about the specific execution.
I rather wanted to know what options I have.
Can I stop the work (without extra costs) or
do I have to hire an expert for that? or... or?
To put it bluntly... A bricklayer builds you a wall with a door without a lintel and says, it’s not necessary. But you are quite sure it is... What to do?

Regards, Jan

Cancel and hire another company? What do I have to pay then?

Just as a very general note, without going into all the details here: In principle, the contractor not only has the obligation to rectify defects but also a right (!) to rectify defects. Therefore, some caution is always advisable in such matters, as the necessary formal steps must be strictly observed before the work can be assigned elsewhere.