Unsatisfactory service

I ordered vegetables thought the Mr D app groceries section (Pnp). Upon cooking the vegetables I noticed there was a piece of woodlike stem between the vegetables that should not be there. I brought it under their attention and they took about a week to respond. Took all of my details, but to no avail to compensate for any inconvenience caused. The whole pack was a big solid frozen block, so there was no way I could see this before cooking it. And yes I tried to loosen the block, nothing. It's like it was laying in their freezers for some time before selling it. This issue was not resolved. Kimone Steffens assisted me. She even expected me to swop it at the store. Why should I drive all the way across town to correct someone else's mistake??? Think twice before you throw good money after these people.