Bad service

I bought a double cheese burger on 6 January only one burger for 54.90 so I paid by card but then she told me my transaction has declined so we did the card transactions again so I left after receiving my burger so I noticed on my app that both transactions went through so I went back to Watergate hungry lion in Mitchell's plain on the 11 January to question the double transaction on which a manager called Anthea said I must get a statement from my bank which my bank charges me 3.50 for I A4 paper and the receipt I gave her The she told me she will get back to me its the 20 January today and no calls from her bad service I called twice where by they dropped the calls