I bought more space for my phone and I didn’t Receive it and I want a refund

You cannot buy more space for your iPhone. The physical storage on your iPhone and the virtual iCloud storage are two completely different things and one cannot substitute for there other.

What's the difference between device storage and iCloud storage? - Apple Support

For all billing inquiries and refund requests, use this link:

Subscriptions and Billing - Official Apple Support

Do you mean that you upgraded your iCloud storage plan? Visit support.apple.com/billing.