Apollo Pharmacy — Regarding customer account

Address:

Apollo pharmacy ,Walaja branch , Opposite to SATHYA home appliances

My Apollo customer ID number is [protected] .We have been a loyal customer to Apollo for many years.Due to some reasons I need to change my mobile number but not my customer ID of Apollo. But employee of Apollo has changed the Apollo ID without customer's knowledge. As we are from middle class we have an intention to save money in account of [protected] and use it later.
All of the 4 employees and one supervisor is telling you can't change phone number of [protected] . Hereafter I'm not gonna be a loyal customer of Apollo. Fed up with Apollo pharmacy service. I waited inside the Apollo more than 45 mins. This made me get stressed. I'm gonna stop using all Apollo products and the pharmacy service.