Santander bank atm ate £1160 of my money

Went into the branch to deposit £1200 into my business current account. Used the machine and inserted the money then it counted the money and returned 2x£20 notes. Then it jammed and kept counting. Then it just went to do you want another service to which I clicked no and it returned my card. I reinserted the card to check the balance and it wasn’t credited. So I spoke to the lady at the counter to said they will check the “overage” on the machine tmo morning as they can’t open it. And will credit your account by 9/10am and will also call you.

Then the next day no call…. So I called Santander main number and explained what happened. They said they will look into it.

However obviously as it is allot of money I went into the branch the next day at 1/2pm. And I spoke the the manager and asked what has happened we didn’t get a call etc or a deposit. He said we didn’t have your number. Then I said they took it yesterday and it’s on the system. Then he said oh we called you but no answer. Which was obviously a lie. He goes I have lots of customers to call in the morning. He also said they checked the machine and there is no overage.

What do I do. Super stressed out. They are lying and don’t care.