Hi Sahira
Sorry to hear this. Your Dobies plants did go in late though which meant there was always a risk of slug damage. For example it is why I always recommend planting spring cabbage before the end of September, so it has a chance to establish before winter and then resist the inevitable slugs. although a few weaker plants always succumb.
I think that many seed companies are naughty in sending out plants too late and making it sound so easy. They must know that a lot of their plants are going to struggle! Or perhaps the unspoken assumption is that the buyer uses lots of slug pellets.
Anyway the neighbours’ weeds are clearly not helping, but some cold weather might. Things will go better in spring and having your soil clean is the best start.