Evri complaint: No customer support and parcel is nowhere to be found

Ordered something from HM and put delivery at the parcel shop, knowing how many problems I had before with Evri and delivering the parcels to other neighbours. For 3 days I’ve been trying to get to speak to a human and I got nothing. I asked for a call back, haven’t received anything. I managed to get an email saying to go and look in the neighbour. After raising I already did that I get a generic email saying they can’t locate my parcel and to raise a complaint if I want to. Of course I do… but these people are making me raising a complaint for being too hard to complain. That web chat is completely useless and no matter what you write you can’t get to a person. I raised a complaint with Hm but I want to make a formal complaint about Evri and their very poor services. It happened so many times and there is no authority to actually investigate them? Ridiculous…