Baseless card blocking

I fail to understand how my credit card can be blocked without it being in arears. First, without prior notification, a courier company called to arrange delivery of a new card. This I declined as my card was still valid. During Dec 2021 I was at the branch who assisted with the ordering of a new card. I was told I will be contacted as it was the festive season and delivery may be delayed. Again, no correspondence. Now, despite having a valid, paid up credit card, I am unable to use it as it has been blocked... Again without notification. Surely besides this being poor service, this cannot be acceptable to the Regulatory bodies. Should I refer this to the Ombudsman.