Evri complaint: They lost my parcel

I booked and Evri Parcel two weeks ago. This was a tracked parcel which was suppose to be delivered in 2-4 days and contain clothes from Myprotein which I had to return. The parcel wasn’t delivered in 4 days and when I contacted Evri customer care, they left me an email saying they are looking into it. They sent me email every day saying they’ll look into it untill this monday there was an email that said they may have lost my parcel. I asked them for a compensation for my items worth £25 and parcel charges of £3 but they have stopped replying to me. Even if they deliver the parcel now it’ll be of no use as my return window to return my items has expired. Their service has been pathetic and on top of that it’s a mental torture trying to get them to reply. I have tried calling them, using chat and emails. It’s been 14 days of me booking the parcel and 5 days of them not responding to me.