PayPal have an excellent refund policy altogether certain what the criteria are and there is certainly a timescale within which you have to make the complaint. Have a look at their terms and conditions to make sure that yours fits within the refund buyer protection policy (I am not certain what they call it) and submit a claim. I think that as this was entered into on 2 July 2015, you may now be outside the timescale for PayPal to deal with the issue but by all means try.
Other than that, the company appears to be registered in MA in the United States and if you’re going to sue them because they will not give you your money back (assuming that you are entitled to your money back) then unfortunately, it’s going to have to be done in the United States. There is no reference that I can see to any Indian address although there are various references to India and an Indian company. However it clearly says the company is incorporated and registered in USA.
The Memorandum of Understanding is extremely disjointed and doesn’t follow any logical sequence and if you had put that document in front of a solicitor and asked whether you should have signed it, and party with any money, the answer would almost certainly have been no.
It is possible to issue proceedings in the United Kingdom but the court would have to decide whether this contract came under United Kingdom law or United States law. If it did decide that United Kingdom law was applicable, you were successful in court, you would then still have to enforce the United Kingdom judgement in the United States which would obviously involve United States lawyers.
Suing a party a cross-border is financially not really viable if the amount being claimed is under about £15,000.
Can I clarify anything for you?