Has become very unreliable lately

I thought my last bad experience might be a once off. Purchased voucher in Oct and only received in Jan after having to follow up a few times and leaving a review here. I purchased a voucher 27 May and have not heard a peep out of Donovan, nor a response to my email enquiring after the voucher. Have now also sent an enquiry on the website. I purchase the vouchers to get enough iCloud space when I see I need to top up. Now I am sitting without back up, and I feel like I shouldn’t be begging to get what I paid for. I don’t know if this company has run into cash flow issues or something else, but that shouldn’t be my issue. Can anyone recommend an alternative place to purchase USD vouchers?