I think you need to rephrase along the folllowing lines or similar:

"We are happy with the operation of this current account." Or "We are happy with the way this current account operates (or runs)."

La proposition de Rob est bonne. Vous pouvez aussi utiliser votre "satisfaction" en verbe.

En cas de réclamation justifiée et notifiée en temps voulu, nous procéderons, à notre convenance, à une suppression des défauts ou à une livraison de remplacement;

In the event of a justified and timely complaint, we shall, at our discretion, undertake either improvement or replacement of the goods;


Industrial and Commercial Bank of China (Asia) Limited
Master Terms and Conditions - Banking Services
Schedule 6 : RMB Current Account
No overdraft of the RMB Current Account shall be allowed and you shall maintain sufficient balance in the RMB Current Account at all times. If there is insufficient balance in the RMB Current Account, we are entitled (but not obliged) to transfer funds from your other accounts with us to cover the shortfall subject to your prior consent and this fund transfer must be completed within the next business day. We are entitled to charge a handling fee for such fund transfer at such rate as we may stipulate from time to time. We may by 14 days�� prior notice to you close the RMB Current Account at our discretion in case such fund transfer arrangements are requested by you to cover the insufficient balance in the RMB Current Account in such frequency as we may determine to be excessive under the circumstances.

https://www.abbey.com/csgs/Satellite?c=GSDetalleProducto&cid...
Legal details
Abbey Current Account
Terms and Conditions
Special Conditions C: For Students
C6. Ending your studies
C6.1 If you decide not to continue with your studies then you must notify us. If you leave your course, you will no longer be eligible for this current account and any Student Overdraft Allowance will terminate. The services on your current account will be changed at our discretion or your current account will be closed.