Starbucks Clearwater

On Sat, I made a purchase at Starbucks Clearwater. The speed points had issues, I was double debited. On Sunday I went back to alert them of this. I have been struggling ever since to get a refund, I have spoken with several people there, emailed my bank statement which was NOT acknowledged until I had to follow up again, then get excuses of manager's being on leave. This is unacceptable, all I requested was a refund, why should I struggle to get my money back.