Parkdean Resorts complaint: Drugs found in caravan, caravan cleanliness not up to standards

We were booked in for our holiday on Friday 23rd July 2021 for 3 nights and 4 days. We also paid extra towards our stay to have the dog with us and an early check in. Upon arrival everything seemed okay, we went into the caravan and found it wasn’t cleaned to the highest of standards(we later found out housekeeping team had only been in the van for 30mins). There was dog hair left on the carpet from previous occupants, our 2 toddlers found a bag of drugs in the cupboard, my other half took these to reception and were told they were hayfever tablets, now i’m sorry but hayfever tablets come in a packet, not a little bag and they certainly aren’t round in shape. These drugs were in fact valium(white diazepam). My mum is a nurse and I phoned her for clarification. There was dead bugs squashed into the cupboard which has the fridge attached and the potspans and plates were all still dirty! We found rubbish left in the cupboard under the sink also.
We have been to Southerness on numerous occasions and have never had any issues before, however, with this most recent stay we were utterly disappointed.
When my other half went to reception he was told that a manager would be in contact with him which never happened, I also spoke to reception on Monday when checking out and I was told a manager would contact me when they had time. I then received a call on Tuesday 27th July 2021 from a manager whom told me she didn’t understand why she was phoning me because as far as she was aware the situation was resolved? We never got an apology or anything! If we hadn’t caught our children with these tablets then this would be a very different complaint. I have worked with the general public for a number of years now and I’m not happy with the way things were dealt with I think they should have been more professional, instead they passed the buck to different people and told me things had been dealt with when they hadn’t and they didn’t understand why they needed to contact me?!