This link will define what is included and chargeable: https://giffgaff.com/help/articles/inclusive-and-non-inclusive-calls-texts-and-services
The goodbag allowance only allows for standard calls to numbers starting with 01, 02, 03 and mobile numbers starting 070 071, 072. 073, 074, 075, 077, 078, and 079. Any other number will be charged with airtime credit.
It is likely the numbers you rang to make appointments. These number can sometime be the chargeable ones: starting with 084, 087, 09 and 118. Though, I'm not too sure about making "local" calls whilst in another EU country (and selected countries), i.e. standard local numbers in that country.
Finally, just make sure you have unlimited calls on your goodybag and/or you have not run out of call allowance.