Discovery bank do not trust..

I have taken out a credit card with Discovery bank in the last month with the intention to build my credit score as that was the reason I rep**** to when asked by the sales consultant. It was done telephonically and the consultant was very knowledgeable in explaining the process.. You are asked to except there terms and conditions as any other institution would ask expecting that there terms and conditions would not negatively impacted you which is generally the case... BUT with my experience I was deceived and not informed that my credit would be so ''NEGATIVELY IMPACTED'' The consultant did not inform me that doing a hard inquiry on my credit profile would cause my credit score to drop by 31 points to where I am now a high risk for credit compared to being average and getting offers from different banks etc.. I have a low chance of getting even a Truworths account currently. My credit score was 627 and now its 596 after there hard search on my profile. You see the thing is they will without your knowledge or understanding do this just to get you signed up and after my inquiry with them I was told I excepted there terms and condition believing that generally when you apply for credit your score would drop 1 to 3 points at most! But because of them not telling you that your score will be drastically affected you go ahead and sign up. My next step will be the credit ombudsman this needs to be addressed as this is deceiving and with the current situation with people struggling they exploiting the honest working class. I have been so attentive to my credit profile no debt no judgements etc a clean credit profile I just needed to have a account to further improve my score and here is where I am currently worse of after there executive department informed me they are in there rights not concerned about mine.