I worked for a company from 2017 - 2020 when I was made redundant during covid. I have worked at another company since then and have now been offered a new position at a new company. However my new employer will not give me a start date until they have recieved a reference from the company I worked for from 2017 - 2020. A reference has been requested from them 3 times and they are not responding, the old company do not have a HR department so I have to give my previous managers details (I know from the company website he still works there). I have called and left a message but also had no response.
I understand that he does not have to give me a reference but I don’t know what to do as my new job will not give me a start date until they receive the reference.
Any advice would be appreciated, thank you.