Principles of Customer Service Skills Non-accredited course Full Information BTEC Diploma in Customer Service NVQ level 2. Full Information BTEC Diploma in Customer Service NVQ level 3. Full Information Level 2 Customer Service Practitioner Apprenticeship Non-accredited course Full Information Level 3 Customer Service Specialist Apprenticeship NVQ level 2. Full Information Level 1 Award in Customer Service NVQ level 3. Full Information Level 2 Award in Customer Service Non-accredited course Full Information Effective Complaint Handling NVQ level 2. Full Information