Disappointed customer

Hi , I'm Cheming and I send you guys an email on Saturday . I bought 2 sim cards on March and the person that I gave it for lost it two days after . I cancel the sim 4 days before March end , and still pay for the sim that month .The problem that I have is I called you guys more that twice and I spoke to three person that forsure me they will cancel the sim immediately, today is the 30th of April and now I must pay for a sim that I did not even use , tomorrow is the 1st May and they will deduct their payment I just want to know how will are they gonna assist or help me because even if I called their customer service line they put me on hold for more than 15 minutes and after that their put the phone done , Is there any way they can help me because if this is the service that I get I won't reccomend it to anyone.