Every business is different and rates are based on your real requirements. Actually a website is an extension of your business in the virtual world. What all we need to know is what actually you need and how many pages shall be there so a tentative rate can be decided.Most pages are generics but sometime your needs may differ and number of pages might differ, apart from that any special function or module might escalate the cost.
So getting a rate over the phone is not a right approach for your business anyway, you can call the designer and discuss your business needs.
Although you may find cheap services offer and alternatives in market but remember Quality is never cheap and neither is your business.
Before calling I would suggest to write down your needs and available data with you, so that you are quite focused on what you need from a web design agency or a designer.
For further query or discussions you may call us on +9999274354