Ask the customer "are you just looking for the cheapest price"
When they say "yes" then say "well there's no point asking me for a price, I'm not cheap"
They will ask you why, you then go on to say that you do a good job, not a cheap job....... then you have the chance to justify your charges.
If you are against pricing on the phone, you can always give examples like "the last lounge I dad was (size) and cost (price), and because the carpet was in a bad state I had to (list steps, ie prespray, agitate, whatever)"
You can always say "usually between £x and £y, depending on the type of carpet and degree of staining"
SELL QUALITY, NOT PRICE
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Don't forget, when Virgin Airlines started, Richard Branson rang Boeing for a price on a second hand 747...... he certainly wasn't expecting the cheapest aircraft, otherwise he would have bought a cast-off from a 3rd world airline, but he did need to know if he could afford it.
Mrs A may ring for a price because she has only got £20 and wants a "splash and dab" merchant, in which case you have saved petrol going to see the job.... otherwise she may just ask the price so she knows how much cash to extract from hubby's wallet so she can pay you!