You do have a period during which you can cancel your workplace pension. This period lasts 30 calendar days, starting from when your employer enroll you in the workplace pension to fulfil its Auto Enrolment duties.
Also, you can ask to transfer your pension to another provider. While Collegia do not charge exit fees, some fees might be applied in the process due to costs passed on to Collegia by the other pension provider.
Regarding MypensionCare, please refer to our membership rules available here