Are ECC-eu a creditable organisation to do my timeshare relinquishment?

I own three fixed weeks at Sunset bay.resort, Torviscous, Tenerife.
I have been a member there for 40 years and have seen many changes. Now we have Hilton Vacations, who seem to have grand plans which could have huge conciseness for present Diamond owners.

I would be grateful for any information you have regarding the options available to Diamond members.

We bought two one week timeshare units on Mc Donalds Dona Lola on private re-sale in 2002. We paid our service charges and used our weeks until 2019, we paid 2020’s charge but could not use due to Corvid, we didn’t pay for 2021 as restrictions still applied. Mc Donalds continued to peruse payment and have now instructed solicitors who are being very heavy handed, Ideally we would like them to write off the disputed weeks and do a deal relative to handing back our weeks.

Hi, I have been contacted by Harlow Consultants promising that they can retrieve almost all my money so long as I pay £6k upfront.
Apparently it is all guaranteed and is a legal contract.
As usual, it is a quick, pressured sale and makes me very suspicious.
Do you have any information on them?

Our solicitors say they will provide a notarised letter stating that our timeshare contract with MGM has been terminated and that under no circumstances should I contact MGM – if they contact me for unpaid maintenance payments I should contact the solicitors. I am feeling more and more uneasy about this as I was hoping for a notarised letter from Muthu saying that the contract had been terminated, Will our solicitor’s letter stand up in court ?