Never been so embarrassed by capitec

I am so so upset and highly embarrassed by Capitec never in my whole life will I recommend this bank. So I went to a store on Friday I must mention that it was so so busy and people were queuing to pay . I was with my grandson there. So long story short I paid for my stuff with my card and it declined 3 times but on the app it went off my account. I was so so embarrassed and did not know what to say or where to hide my face it was a disgrace my grandson's keep on asking gran what is wrong what is wrong. How do you explain a *********** bank failed you I don't know how to show my face again at the store it was beyond embarrassing no apology or nothing what n disgrace