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Generally, the warranty period for water and electricity in a building is two years, but after you renovate the house, they will shirk it for various reasons.
If you can't find evidence, you are responsible from the blocked place! Now the first issue is to get the sewers open and find the blockages.
According to the design specification, it is two sewer pipes.
This involves a thorough cleaning of the septic tank or sewage tank under the sewer, mainly because these places are already clogged with the garbage and debris you mentioned.
It is not feasible, a series of problems will appear after moving, and it will be more blocked, Chinese families generally do not recommend to do open kitchens, after all, it is related to food and drink, and it is easy to cause the phenomenon of cooking smoke running all over the house!
Generally, the toilet and kitchen drain are separated.