If I understand what you have done, you cannot properly add those probabilities. Without knowing how much probability theory you know, it is hard to give an answer that you will be certain to understand.

Based on your data, what is the total number of loans made that were holiday loans from Region B that were not to be paid by automated deduction through a debit card? What number of those loans had repayment problems? If you like to think in terms of tables, you need to be thinking in terms of two three-dimensional tables, one showing total loans in each category and the other showing problem loans in each category. As a theoretical matter, there will be a difficulty if any category has a small number of total loans. You may be expected to ignore this difficulty so long as the number of total loans in a category is positive, but you cannot ignore it if the number of loans is zero. What techniques have you been given to evaluate sample sizes?