I need a lawyer, area of expertise: consumer protection

Dear Ladies and Gentleman, with the following issue I would like to ask you for legal assistance. In august 2017 I was on my way to london to a Barclays branch to send the full amount from my bankaccount to my munich bankaccount and to subsequently cancel my barclays account because I have no use for this. In the barclays branch they accept the transaction without any problems although I had just my passport as a identification document and I had no other documents to prove that I have a bankaccount at barclays. They gave me a transaction number. The transaction never arrived at my munich bankaccount. I was calling to the the barclays customer center and they send me to my adresse in munich my sort and account number. With my "new" sort- and accountnumber I wrote to barclays to get the information what it is about my transaction and the credit of my bankaccount. They responded and say that my bankaccount is now a "dorman account" and I got a personal check over about 300 pound. The amount of the transaction I sent must be something about 12 to 13k in pound. Informationen about what happend with the transaction I did and how I can get to my money I didnt got. I would be very happy if you can help me out in my situation and help me to get to my money in the form of getting access to my bankaccount with the full credit bevore the transaction I did. Please let me also know how much I have to pay for your service. Thank you very much. Sincerely yours, Simon Eggler