Extremely Poor level of Service

On our first visit we waited for more than 20 mins without even a waiter attending to our table, the store was not busy. Thereafter we called the manager who apologised but we refused to wait any further, left without supper. The next time was last week Tuesday, when there was just a lack of service, and we had to call the manager again who had to sort things out. Last night we once again visited as we felt the special was value for money. Yet the poor service never changed, the veggies were so unattractively put in my plate, the butter for the rolls were actually oil, as it was melted, then the manager brings us rock hard frozen butter. Can he not think for himself that we cannot use this on the rolls? When I asked then he takes it to put in warmer for a little while and then back to us,all this while our food is sitting on the table getting cold.Further, during the meal, the waitress comes to our table and starts cleaning up, putting her fingers into our mussel pot to hold it and we were not done with it at that stage. I asked her why did you take it, she rep**** that she was asked by the managers to clear. While the customers are still eating?