When phoning BT to negotiate a new contract and digital voice, I was put on hold for sometimes 20 minutes at a time. I thought it was a free phone from my BT landline to them but it cost me£12 which I thought was disgusting. Thanks BT from a disgruntled pensioner .
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If you are on PAYG, then its not free. Try 0800 800 150, which is free.
If you used the BT 0330.1234.150 number this is chargeable unless you have a calling package which gives you "free" calls that include 03 numbers.
See links
https://www.ofcom.org.uk/phones-and-broadband/phone-numbers/what-are-03-numbers
https://www.bt.com/content/dam/bt/storefront/pdfs/BT_PhoneTariff_Residential.pdf